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mediawiki ltr sitedir-ltr mw-hide-empty-elt ns-0 ns-subject mw-editable page-Octàgon rootpage-Octàgon skin-vector-2022 action-view"><a class="mw-jump-link" href="#bodyContent">Vés al contingut</a> <div class="vector-header-container"> <header class="vector-header mw-header"> <div class="vector-header-start"> <nav class="vector-main-menu-landmark" aria-label="Lloc"> <div id="vector-main-menu-dropdown" class="vector-dropdown vector-main-menu-dropdown vector-button-flush-left vector-button-flush-right" > <input type="checkbox" id="vector-main-menu-dropdown-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-main-menu-dropdown" class="vector-dropdown-checkbox " aria-label="Menú principal" > <label id="vector-main-menu-dropdown-label" for="vector-main-menu-dropdown-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--icon-only " aria-hidden="true" ><span class="vector-icon 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data-event-name="pinnable-header.vector-main-menu.unpin">amaga</button> </div> <div id="p-navigation" class="vector-menu mw-portlet mw-portlet-navigation" > <div class="vector-menu-heading"> Navegació </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="n-mainpage-description" class="mw-list-item"><a href="/wiki/Portada" title="Visiteu la pàgina principal [z]" accesskey="z"><span>Portada</span></a></li><li id="n-randompage" class="mw-list-item"><a href="/wiki/Especial:Article_aleatori" title="Carrega una pàgina a l’atzar [x]" accesskey="x"><span>Article a l'atzar</span></a></li><li id="n-Articles-de-qualitat" class="mw-list-item"><a href="/wiki/Viquip%C3%A8dia:Articles_de_qualitat"><span>Articles de qualitat</span></a></li> </ul> </div> </div> <div id="p-Comunitat" class="vector-menu mw-portlet mw-portlet-Comunitat" > <div class="vector-menu-heading"> Comunitat </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="n-portal" class="mw-list-item"><a href="/wiki/Viquip%C3%A8dia:Portal" title="Sobre el projecte, què podeu fer, on trobareu les coses"><span>Portal viquipedista</span></a></li><li id="n-Agenda-d'actes" class="mw-list-item"><a href="/wiki/Viquip%C3%A8dia:Trobades"><span>Agenda d'actes</span></a></li><li id="n-recentchanges" class="mw-list-item"><a href="/wiki/Especial:Canvis_recents" title="Una llista dels canvis recents al wiki [r]" accesskey="r"><span>Canvis recents</span></a></li><li id="n-La-taverna" class="mw-list-item"><a href="/wiki/Viquip%C3%A8dia:La_taverna"><span>La taverna</span></a></li><li id="n-contactpage" class="mw-list-item"><a href="/wiki/Viquip%C3%A8dia:Contacte"><span>Contacte</span></a></li><li id="n-Xat" class="mw-list-item"><a href="/wiki/Viquip%C3%A8dia:Canals_IRC"><span>Xat</span></a></li><li id="n-help" class="mw-list-item"><a href="/wiki/Viquip%C3%A8dia:Ajuda" title="El lloc per a saber més coses"><span>Ajuda</span></a></li> </ul> </div> </div> </div> </div> </div> </div> </nav> <a href="/wiki/Portada" class="mw-logo"> <img class="mw-logo-icon" src="/static/images/icons/wikipedia.png" alt="" aria-hidden="true" height="50" width="50"> <span class="mw-logo-container skin-invert"> <img class="mw-logo-wordmark" alt="Viquipèdia" src="/static/images/mobile/copyright/wikipedia-wordmark-ca.svg" style="width: 7.5em; height: 1.4375em;"> <img class="mw-logo-tagline" alt="l'Enciclopèdia Lliure" src="/static/images/mobile/copyright/wikipedia-tagline-ca.svg" width="120" height="14" style="width: 7.5em; height: 0.875em;"> </span> </a> </div> <div class="vector-header-end"> <div id="p-search" role="search" class="vector-search-box-vue vector-search-box-collapses vector-search-box-show-thumbnail vector-search-box-auto-expand-width vector-search-box"> <a href="/wiki/Especial:Cerca" class="cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--icon-only search-toggle" title="Cerca a la Viquipèdia [f]" accesskey="f"><span class="vector-icon mw-ui-icon-search mw-ui-icon-wikimedia-search"></span> <span>Cerca</span> </a> <div class="vector-typeahead-search-container"> <div class="cdx-typeahead-search cdx-typeahead-search--show-thumbnail cdx-typeahead-search--auto-expand-width"> <form action="/w/index.php" id="searchform" class="cdx-search-input cdx-search-input--has-end-button"> <div id="simpleSearch" class="cdx-search-input__input-wrapper" data-search-loc="header-moved"> <div class="cdx-text-input cdx-text-input--has-start-icon"> <input class="cdx-text-input__input" type="search" name="search" placeholder="Cerca a Viquipèdia" aria-label="Cerca a Viquipèdia" autocapitalize="sentences" title="Cerca a la Viquipèdia [f]" accesskey="f" id="searchInput" > <span class="cdx-text-input__icon cdx-text-input__start-icon"></span> </div> <input type="hidden" name="title" value="Especial:Cerca"> </div> <button class="cdx-button cdx-search-input__end-button">Cerca</button> </form> </div> </div> </div> <nav class="vector-user-links vector-user-links-wide" aria-label="Eines personals"> <div class="vector-user-links-main"> <div id="p-vector-user-menu-preferences" class="vector-menu mw-portlet emptyPortlet" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> </ul> </div> </div> <div id="p-vector-user-menu-userpage" class="vector-menu mw-portlet emptyPortlet" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> </ul> </div> </div> <nav class="vector-appearance-landmark" aria-label="Aparença"> <div id="vector-appearance-dropdown" class="vector-dropdown " title="Change the appearance of the page's font size, width, and color" > <input type="checkbox" id="vector-appearance-dropdown-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-appearance-dropdown" class="vector-dropdown-checkbox " aria-label="Aparença" > <label id="vector-appearance-dropdown-label" for="vector-appearance-dropdown-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--icon-only " aria-hidden="true" ><span class="vector-icon mw-ui-icon-appearance mw-ui-icon-wikimedia-appearance"></span> <span class="vector-dropdown-label-text">Aparença</span> </label> <div class="vector-dropdown-content"> <div id="vector-appearance-unpinned-container" class="vector-unpinned-container"> </div> </div> </div> </nav> <div id="p-vector-user-menu-notifications" class="vector-menu mw-portlet emptyPortlet" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> </ul> </div> </div> <div id="p-vector-user-menu-overflow" class="vector-menu mw-portlet" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="pt-sitesupport-2" class="user-links-collapsible-item mw-list-item user-links-collapsible-item"><a data-mw="interface" href="//donate.wikimedia.org/wiki/Special:FundraiserRedirector?utm_source=donate&utm_medium=sidebar&utm_campaign=C13_ca.wikipedia.org&uselang=ca" class=""><span>Donatius</span></a> </li> <li id="pt-createaccount-2" class="user-links-collapsible-item mw-list-item user-links-collapsible-item"><a data-mw="interface" href="/w/index.php?title=Especial:Crea_compte&returnto=Oct%C3%A0gon" title="Us animem a crear un compte i iniciar una sessió, encara que no és obligatori" class=""><span>Crea un compte</span></a> </li> <li id="pt-login-2" class="user-links-collapsible-item mw-list-item user-links-collapsible-item"><a data-mw="interface" href="/w/index.php?title=Especial:Registre_i_entrada&returnto=Oct%C3%A0gon" title="Us animem a registrar-vos, però no és obligatori [o]" accesskey="o" class=""><span>Inicia la sessió</span></a> </li> </ul> </div> </div> </div> <div id="vector-user-links-dropdown" class="vector-dropdown vector-user-menu vector-button-flush-right vector-user-menu-logged-out" title="Més opcions" > <input type="checkbox" id="vector-user-links-dropdown-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-user-links-dropdown" class="vector-dropdown-checkbox " aria-label="Eines personals" > <label id="vector-user-links-dropdown-label" for="vector-user-links-dropdown-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--icon-only " aria-hidden="true" ><span class="vector-icon mw-ui-icon-ellipsis mw-ui-icon-wikimedia-ellipsis"></span> <span class="vector-dropdown-label-text">Eines personals</span> </label> <div class="vector-dropdown-content"> <div id="p-personal" class="vector-menu mw-portlet mw-portlet-personal user-links-collapsible-item" title="Menú d'usuari" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="pt-sitesupport" class="user-links-collapsible-item mw-list-item"><a href="//donate.wikimedia.org/wiki/Special:FundraiserRedirector?utm_source=donate&utm_medium=sidebar&utm_campaign=C13_ca.wikipedia.org&uselang=ca"><span>Donatius</span></a></li><li id="pt-createaccount" class="user-links-collapsible-item mw-list-item"><a href="/w/index.php?title=Especial:Crea_compte&returnto=Oct%C3%A0gon" title="Us animem a crear un compte i iniciar una sessió, encara que no és obligatori"><span class="vector-icon mw-ui-icon-userAdd mw-ui-icon-wikimedia-userAdd"></span> <span>Crea un compte</span></a></li><li id="pt-login" class="user-links-collapsible-item mw-list-item"><a href="/w/index.php?title=Especial:Registre_i_entrada&returnto=Oct%C3%A0gon" title="Us animem a registrar-vos, però no és obligatori [o]" accesskey="o"><span class="vector-icon mw-ui-icon-logIn mw-ui-icon-wikimedia-logIn"></span> <span>Inicia la sessió</span></a></li> </ul> </div> </div> <div id="p-user-menu-anon-editor" class="vector-menu mw-portlet mw-portlet-user-menu-anon-editor" > <div class="vector-menu-heading"> Pàgines per a editors no registrats <a href="/wiki/Ajuda:Introducci%C3%B3" aria-label="Vegeu més informació sobre l'edició"><span>més informació</span></a> </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="pt-anoncontribs" class="mw-list-item"><a href="/wiki/Especial:Contribucions_pr%C3%B2pies" title="Una llista de les modificacions fetes des d'aquesta adreça IP [y]" accesskey="y"><span>Contribucions</span></a></li><li id="pt-anontalk" class="mw-list-item"><a href="/wiki/Especial:Discussi%C3%B3_personal" title="Discussió sobre les edicions per aquesta adreça ip. [n]" accesskey="n"><span>Discussió per aquest IP</span></a></li> </ul> </div> </div> </div> </div> </nav> </div> </header> </div> <div class="mw-page-container"> <div class="mw-page-container-inner"> <div class="vector-sitenotice-container"> <div id="siteNotice"></div> </div> <div class="vector-column-start"> <div class="vector-main-menu-container"> <div id="mw-navigation"> <nav id="mw-panel" class="vector-main-menu-landmark" aria-label="Lloc"> <div id="vector-main-menu-pinned-container" class="vector-pinned-container"> </div> </nav> </div> </div> <div class="vector-sticky-pinned-container"> <nav id="mw-panel-toc" aria-label="Contingut" data-event-name="ui.sidebar-toc" class="mw-table-of-contents-container vector-toc-landmark"> <div id="vector-toc-pinned-container" class="vector-pinned-container"> <div id="vector-toc" class="vector-toc vector-pinnable-element"> <div class="vector-pinnable-header vector-toc-pinnable-header vector-pinnable-header-pinned" data-feature-name="toc-pinned" data-pinnable-element-id="vector-toc" > <h2 class="vector-pinnable-header-label">Contingut</h2> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-pin-button" data-event-name="pinnable-header.vector-toc.pin">mou a la barra lateral</button> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-unpin-button" data-event-name="pinnable-header.vector-toc.unpin">amaga</button> </div> <ul class="vector-toc-contents" id="mw-panel-toc-list"> <li id="toc-mw-content-text" class="vector-toc-list-item vector-toc-level-1"> <a href="#" class="vector-toc-link"> <div class="vector-toc-text">Inici</div> </a> </li> <li id="toc-Octàgon_regular" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Octàgon_regular"> <div class="vector-toc-text"> <span class="vector-toc-numb">1</span> <span>Octàgon regular</span> </div> </a> <button aria-controls="toc-Octàgon_regular-sublist" class="cdx-button cdx-button--weight-quiet cdx-button--icon-only vector-toc-toggle"> <span class="vector-icon mw-ui-icon-wikimedia-expand"></span> <span>Commuta la subsecció Octàgon regular</span> </button> <ul id="toc-Octàgon_regular-sublist" class="vector-toc-list"> <li id="toc-Perímetre" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Perímetre"> <div class="vector-toc-text"> <span class="vector-toc-numb">1.1</span> <span>Perímetre</span> </div> </a> <ul id="toc-Perímetre-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Apotema" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Apotema"> <div class="vector-toc-text"> <span class="vector-toc-numb">1.2</span> <span>Apotema</span> </div> </a> <ul id="toc-Apotema-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Àrea" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Àrea"> <div class="vector-toc-text"> <span class="vector-toc-numb">1.3</span> <span>Àrea</span> </div> </a> <ul id="toc-Àrea-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li id="toc-Al_dia_a_dia" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Al_dia_a_dia"> <div class="vector-toc-text"> <span class="vector-toc-numb">2</span> <span>Al dia a dia</span> </div> </a> <ul id="toc-Al_dia_a_dia-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Figures_geomètriques_derivades" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Figures_geomètriques_derivades"> <div class="vector-toc-text"> <span class="vector-toc-numb">3</span> <span>Figures geomètriques derivades</span> </div> </a> <ul id="toc-Figures_geomètriques_derivades-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Referències" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Referències"> <div class="vector-toc-text"> <span class="vector-toc-numb">4</span> <span>Referències</span> </div> </a> <ul id="toc-Referències-sublist" class="vector-toc-list"> </ul> </li> </ul> </div> </div> </nav> </div> </div> <div class="mw-content-container"> <main id="content" class="mw-body"> <header class="mw-body-header vector-page-titlebar"> <nav aria-label="Contingut" class="vector-toc-landmark"> <div id="vector-page-titlebar-toc" class="vector-dropdown vector-page-titlebar-toc vector-button-flush-left" > <input type="checkbox" id="vector-page-titlebar-toc-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-page-titlebar-toc" class="vector-dropdown-checkbox " aria-label="Commuta la taula de continguts." > <label id="vector-page-titlebar-toc-label" for="vector-page-titlebar-toc-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--icon-only " aria-hidden="true" ><span class="vector-icon mw-ui-icon-listBullet mw-ui-icon-wikimedia-listBullet"></span> <span class="vector-dropdown-label-text">Commuta la taula de continguts.</span> </label> <div class="vector-dropdown-content"> <div id="vector-page-titlebar-toc-unpinned-container" class="vector-unpinned-container"> </div> </div> </div> </nav> <h1 id="firstHeading" class="firstHeading mw-first-heading"><span class="mw-page-title-main">Octàgon</span></h1> <div id="p-lang-btn" class="vector-dropdown mw-portlet mw-portlet-lang" > <input type="checkbox" id="p-lang-btn-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-p-lang-btn" class="vector-dropdown-checkbox mw-interlanguage-selector" aria-label="Vés a un article en una altra llengua. Disponible en 72 llengües" > <label id="p-lang-btn-label" for="p-lang-btn-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--action-progressive mw-portlet-lang-heading-72" aria-hidden="true" ><span class="vector-icon mw-ui-icon-language-progressive mw-ui-icon-wikimedia-language-progressive"></span> <span class="vector-dropdown-label-text">72 llengües</span> </label> <div class="vector-dropdown-content"> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li class="interlanguage-link interwiki-af mw-list-item"><a href="https://af.wikipedia.org/wiki/Agthoek" title="Agthoek - afrikaans" lang="af" hreflang="af" data-title="Agthoek" data-language-autonym="Afrikaans" data-language-local-name="afrikaans" class="interlanguage-link-target"><span>Afrikaans</span></a></li><li class="interlanguage-link interwiki-ar mw-list-item"><a href="https://ar.wikipedia.org/wiki/%D9%85%D8%AB%D9%85%D9%86" title="مثمن - àrab" lang="ar" hreflang="ar" data-title="مثمن" data-language-autonym="العربية" data-language-local-name="àrab" class="interlanguage-link-target"><span>العربية</span></a></li><li class="interlanguage-link interwiki-as mw-list-item"><a href="https://as.wikipedia.org/wiki/%E0%A6%85%E0%A6%B7%E0%A7%8D%E0%A6%9F%E0%A6%AD%E0%A7%81%E0%A6%9C" title="অষ্টভুজ - assamès" lang="as" hreflang="as" data-title="অষ্টভুজ" data-language-autonym="অসমীয়া" data-language-local-name="assamès" class="interlanguage-link-target"><span>অসমীয়া</span></a></li><li class="interlanguage-link interwiki-ast mw-list-item"><a href="https://ast.wikipedia.org/wiki/Oct%C3%B3gonu" title="Octógonu - asturià" lang="ast" hreflang="ast" data-title="Octógonu" data-language-autonym="Asturianu" data-language-local-name="asturià" class="interlanguage-link-target"><span>Asturianu</span></a></li><li class="interlanguage-link interwiki-ba mw-list-item"><a href="https://ba.wikipedia.org/wiki/%D2%BA%D0%B8%D0%B3%D0%B5%D2%99%D0%BC%D3%A9%D0%B9%D3%A9%D1%88" title="Һигеҙмөйөш - baixkir" lang="ba" hreflang="ba" data-title="Һигеҙмөйөш" data-language-autonym="Башҡортса" data-language-local-name="baixkir" class="interlanguage-link-target"><span>Башҡортса</span></a></li><li class="interlanguage-link interwiki-bcl mw-list-item"><a href="https://bcl.wikipedia.org/wiki/Oktagono" title="Oktagono - Central Bikol" lang="bcl" hreflang="bcl" data-title="Oktagono" data-language-autonym="Bikol Central" data-language-local-name="Central Bikol" class="interlanguage-link-target"><span>Bikol Central</span></a></li><li class="interlanguage-link interwiki-bg mw-list-item"><a href="https://bg.wikipedia.org/wiki/%D0%9E%D1%81%D0%BC%D0%BE%D1%8A%D0%B3%D1%8A%D0%BB%D0%BD%D0%B8%D0%BA" title="Осмоъгълник - búlgar" lang="bg" hreflang="bg" data-title="Осмоъгълник" data-language-autonym="Български" data-language-local-name="búlgar" class="interlanguage-link-target"><span>Български</span></a></li><li class="interlanguage-link interwiki-bs mw-list-item"><a href="https://bs.wikipedia.org/wiki/Osmougao" title="Osmougao - bosnià" lang="bs" hreflang="bs" data-title="Osmougao" data-language-autonym="Bosanski" data-language-local-name="bosnià" class="interlanguage-link-target"><span>Bosanski</span></a></li><li class="interlanguage-link interwiki-ce mw-list-item"><a href="https://ce.wikipedia.org/wiki/%D0%91%D0%B0%D1%80%D1%85%D3%80%D1%81%D0%B0%D0%B1%D0%B5%D1%80%D0%B3" title="БархӀсаберг - txetxè" lang="ce" hreflang="ce" data-title="БархӀсаберг" data-language-autonym="Нохчийн" data-language-local-name="txetxè" class="interlanguage-link-target"><span>Нохчийн</span></a></li><li class="interlanguage-link interwiki-ckb mw-list-item"><a href="https://ckb.wikipedia.org/wiki/%DA%BE%DB%95%D8%B4%D8%AA%D9%84%D8%A7" title="ھەشتلا - kurd central" lang="ckb" hreflang="ckb" data-title="ھەشتلا" data-language-autonym="کوردی" data-language-local-name="kurd central" class="interlanguage-link-target"><span>کوردی</span></a></li><li class="interlanguage-link interwiki-cs mw-list-item"><a href="https://cs.wikipedia.org/wiki/Osmi%C3%BAheln%C3%ADk" title="Osmiúhelník - txec" lang="cs" hreflang="cs" data-title="Osmiúhelník" data-language-autonym="Čeština" data-language-local-name="txec" class="interlanguage-link-target"><span>Čeština</span></a></li><li class="interlanguage-link interwiki-cv mw-list-item"><a href="https://cv.wikipedia.org/wiki/%D0%A1%D0%B0%D0%BA%C4%83%D1%80%D0%BA%C4%95%D1%82%D0%B5%D1%81%D0%BB%C4%95%D1%85" title="Сакăркĕтеслĕх - txuvaix" lang="cv" hreflang="cv" data-title="Сакăркĕтеслĕх" data-language-autonym="Чӑвашла" data-language-local-name="txuvaix" class="interlanguage-link-target"><span>Чӑвашла</span></a></li><li class="interlanguage-link interwiki-cy mw-list-item"><a href="https://cy.wikipedia.org/wiki/Octagon" title="Octagon - gal·lès" lang="cy" hreflang="cy" data-title="Octagon" data-language-autonym="Cymraeg" data-language-local-name="gal·lès" class="interlanguage-link-target"><span>Cymraeg</span></a></li><li class="interlanguage-link interwiki-da mw-list-item"><a href="https://da.wikipedia.org/wiki/Oktogon" title="Oktogon - danès" lang="da" hreflang="da" data-title="Oktogon" data-language-autonym="Dansk" data-language-local-name="danès" class="interlanguage-link-target"><span>Dansk</span></a></li><li class="interlanguage-link interwiki-de mw-list-item"><a href="https://de.wikipedia.org/wiki/Achteck" title="Achteck - alemany" lang="de" hreflang="de" data-title="Achteck" data-language-autonym="Deutsch" data-language-local-name="alemany" class="interlanguage-link-target"><span>Deutsch</span></a></li><li class="interlanguage-link interwiki-el mw-list-item"><a href="https://el.wikipedia.org/wiki/%CE%9F%CE%BA%CF%84%CE%AC%CE%B3%CF%89%CE%BD%CE%BF" title="Οκτάγωνο - grec" lang="el" hreflang="el" data-title="Οκτάγωνο" data-language-autonym="Ελληνικά" data-language-local-name="grec" class="interlanguage-link-target"><span>Ελληνικά</span></a></li><li class="interlanguage-link interwiki-eml mw-list-item"><a href="https://eml.wikipedia.org/wiki/Ot%C3%A0gon" title="Otàgon - Emiliano-Romagnolo" lang="egl" hreflang="egl" data-title="Otàgon" data-language-autonym="Emiliàn e rumagnòl" data-language-local-name="Emiliano-Romagnolo" class="interlanguage-link-target"><span>Emiliàn e rumagnòl</span></a></li><li class="interlanguage-link interwiki-en mw-list-item"><a href="https://en.wikipedia.org/wiki/Octagon" title="Octagon - anglès" lang="en" hreflang="en" data-title="Octagon" data-language-autonym="English" data-language-local-name="anglès" class="interlanguage-link-target"><span>English</span></a></li><li class="interlanguage-link interwiki-eo mw-list-item"><a href="https://eo.wikipedia.org/wiki/Oklatero" title="Oklatero - esperanto" lang="eo" hreflang="eo" data-title="Oklatero" data-language-autonym="Esperanto" data-language-local-name="esperanto" class="interlanguage-link-target"><span>Esperanto</span></a></li><li class="interlanguage-link interwiki-es mw-list-item"><a href="https://es.wikipedia.org/wiki/Oct%C3%B3gono" title="Octógono - espanyol" lang="es" hreflang="es" data-title="Octógono" data-language-autonym="Español" data-language-local-name="espanyol" class="interlanguage-link-target"><span>Español</span></a></li><li class="interlanguage-link interwiki-eu mw-list-item"><a href="https://eu.wikipedia.org/wiki/Oktogono" title="Oktogono - basc" lang="eu" hreflang="eu" data-title="Oktogono" data-language-autonym="Euskara" data-language-local-name="basc" class="interlanguage-link-target"><span>Euskara</span></a></li><li class="interlanguage-link interwiki-fa mw-list-item"><a href="https://fa.wikipedia.org/wiki/%D9%87%D8%B4%D8%AA%E2%80%8C%D8%B6%D9%84%D8%B9%DB%8C" title="هشت‌ضلعی - persa" lang="fa" hreflang="fa" data-title="هشت‌ضلعی" data-language-autonym="فارسی" data-language-local-name="persa" class="interlanguage-link-target"><span>فارسی</span></a></li><li class="interlanguage-link interwiki-fi mw-list-item"><a href="https://fi.wikipedia.org/wiki/Kahdeksankulmio" title="Kahdeksankulmio - finès" lang="fi" hreflang="fi" data-title="Kahdeksankulmio" data-language-autonym="Suomi" data-language-local-name="finès" class="interlanguage-link-target"><span>Suomi</span></a></li><li class="interlanguage-link interwiki-fr mw-list-item"><a href="https://fr.wikipedia.org/wiki/Octogone" title="Octogone - francès" lang="fr" hreflang="fr" data-title="Octogone" data-language-autonym="Français" data-language-local-name="francès" class="interlanguage-link-target"><span>Français</span></a></li><li class="interlanguage-link interwiki-ga mw-list-item"><a href="https://ga.wikipedia.org/wiki/Ochtag%C3%A1n" title="Ochtagán - irlandès" lang="ga" hreflang="ga" data-title="Ochtagán" data-language-autonym="Gaeilge" data-language-local-name="irlandès" class="interlanguage-link-target"><span>Gaeilge</span></a></li><li class="interlanguage-link interwiki-gl mw-list-item"><a href="https://gl.wikipedia.org/wiki/Oct%C3%B3gono" title="Octógono - gallec" lang="gl" hreflang="gl" data-title="Octógono" data-language-autonym="Galego" data-language-local-name="gallec" class="interlanguage-link-target"><span>Galego</span></a></li><li class="interlanguage-link interwiki-hak mw-list-item"><a href="https://hak.wikipedia.org/wiki/Pat-pi%C3%AAn-h%C3%ACn" title="Pat-piên-hìn - xinès hakka" lang="hak" hreflang="hak" data-title="Pat-piên-hìn" data-language-autonym="客家語 / Hak-kâ-ngî" data-language-local-name="xinès hakka" class="interlanguage-link-target"><span>客家語 / Hak-kâ-ngî</span></a></li><li class="interlanguage-link interwiki-he mw-list-item"><a href="https://he.wikipedia.org/wiki/%D7%9E%D7%AA%D7%95%D7%9E%D7%9F" title="מתומן - hebreu" lang="he" hreflang="he" data-title="מתומן" data-language-autonym="עברית" data-language-local-name="hebreu" class="interlanguage-link-target"><span>עברית</span></a></li><li class="interlanguage-link interwiki-hi mw-list-item"><a href="https://hi.wikipedia.org/wiki/%E0%A4%85%E0%A4%B7%E0%A5%8D%E0%A4%9F%E0%A4%AD%E0%A5%81%E0%A4%9C" title="अष्टभुज - hindi" lang="hi" hreflang="hi" data-title="अष्टभुज" data-language-autonym="हिन्दी" data-language-local-name="hindi" class="interlanguage-link-target"><span>हिन्दी</span></a></li><li class="interlanguage-link interwiki-ht mw-list-item"><a href="https://ht.wikipedia.org/wiki/Oktag%C3%B2n" title="Oktagòn - crioll d’Haití" lang="ht" hreflang="ht" data-title="Oktagòn" data-language-autonym="Kreyòl ayisyen" data-language-local-name="crioll d’Haití" class="interlanguage-link-target"><span>Kreyòl ayisyen</span></a></li><li class="interlanguage-link interwiki-hu mw-list-item"><a href="https://hu.wikipedia.org/wiki/Nyolcsz%C3%B6g" title="Nyolcszög - hongarès" lang="hu" hreflang="hu" data-title="Nyolcszög" data-language-autonym="Magyar" data-language-local-name="hongarès" class="interlanguage-link-target"><span>Magyar</span></a></li><li class="interlanguage-link interwiki-hy mw-list-item"><a href="https://hy.wikipedia.org/wiki/%D5%88%D6%82%D5%A9%D5%A1%D5%B6%D5%AF%D5%B5%D5%B8%D6%82%D5%B6" title="Ութանկյուն - armeni" lang="hy" hreflang="hy" data-title="Ութանկյուն" data-language-autonym="Հայերեն" data-language-local-name="armeni" class="interlanguage-link-target"><span>Հայերեն</span></a></li><li class="interlanguage-link interwiki-id mw-list-item"><a href="https://id.wikipedia.org/wiki/Segi_delapan" title="Segi delapan - indonesi" lang="id" hreflang="id" data-title="Segi delapan" data-language-autonym="Bahasa Indonesia" data-language-local-name="indonesi" class="interlanguage-link-target"><span>Bahasa Indonesia</span></a></li><li class="interlanguage-link interwiki-io mw-list-item"><a href="https://io.wikipedia.org/wiki/Oktogono" title="Oktogono - ido" lang="io" hreflang="io" data-title="Oktogono" data-language-autonym="Ido" data-language-local-name="ido" class="interlanguage-link-target"><span>Ido</span></a></li><li class="interlanguage-link interwiki-it mw-list-item"><a href="https://it.wikipedia.org/wiki/Ottagono" title="Ottagono - italià" lang="it" hreflang="it" data-title="Ottagono" data-language-autonym="Italiano" data-language-local-name="italià" class="interlanguage-link-target"><span>Italiano</span></a></li><li class="interlanguage-link interwiki-ja mw-list-item"><a href="https://ja.wikipedia.org/wiki/%E5%85%AB%E8%A7%92%E5%BD%A2" title="八角形 - japonès" lang="ja" hreflang="ja" data-title="八角形" data-language-autonym="日本語" data-language-local-name="japonès" class="interlanguage-link-target"><span>日本語</span></a></li><li class="interlanguage-link interwiki-ka mw-list-item"><a href="https://ka.wikipedia.org/wiki/%E1%83%9D%E1%83%A5%E1%83%A2%E1%83%90%E1%83%92%E1%83%9D%E1%83%9C%E1%83%98" title="ოქტაგონი - georgià" lang="ka" hreflang="ka" data-title="ოქტაგონი" data-language-autonym="ქართული" data-language-local-name="georgià" class="interlanguage-link-target"><span>ქართული</span></a></li><li class="interlanguage-link interwiki-ko mw-list-item"><a href="https://ko.wikipedia.org/wiki/%ED%8C%94%EA%B0%81%ED%98%95" title="팔각형 - coreà" lang="ko" hreflang="ko" data-title="팔각형" data-language-autonym="한국어" data-language-local-name="coreà" class="interlanguage-link-target"><span>한국어</span></a></li><li class="interlanguage-link interwiki-la mw-list-item"><a href="https://la.wikipedia.org/wiki/Octagonum" title="Octagonum - llatí" lang="la" hreflang="la" data-title="Octagonum" data-language-autonym="Latina" data-language-local-name="llatí" class="interlanguage-link-target"><span>Latina</span></a></li><li class="interlanguage-link interwiki-lfn mw-list-item"><a href="https://lfn.wikipedia.org/wiki/Otagon" title="Otagon - Lingua Franca Nova" lang="lfn" hreflang="lfn" data-title="Otagon" data-language-autonym="Lingua Franca Nova" data-language-local-name="Lingua Franca Nova" class="interlanguage-link-target"><span>Lingua Franca Nova</span></a></li><li class="interlanguage-link interwiki-lmo mw-list-item"><a href="https://lmo.wikipedia.org/wiki/Ot%C3%A0gon" title="Otàgon - llombard" lang="lmo" hreflang="lmo" data-title="Otàgon" data-language-autonym="Lombard" data-language-local-name="llombard" class="interlanguage-link-target"><span>Lombard</span></a></li><li class="interlanguage-link interwiki-lt mw-list-item"><a href="https://lt.wikipedia.org/wiki/A%C5%A1tuonkampis" title="Aštuonkampis - lituà" lang="lt" hreflang="lt" data-title="Aštuonkampis" data-language-autonym="Lietuvių" data-language-local-name="lituà" class="interlanguage-link-target"><span>Lietuvių</span></a></li><li class="interlanguage-link interwiki-lv mw-list-item"><a href="https://lv.wikipedia.org/wiki/Asto%C5%86st%C5%ABris" title="Astoņstūris - letó" lang="lv" hreflang="lv" data-title="Astoņstūris" data-language-autonym="Latviešu" data-language-local-name="letó" class="interlanguage-link-target"><span>Latviešu</span></a></li><li class="interlanguage-link interwiki-mk mw-list-item"><a href="https://mk.wikipedia.org/wiki/%D0%9E%D1%81%D1%83%D0%BC%D0%B0%D0%B3%D0%BE%D0%BB%D0%BD%D0%B8%D0%BA" title="Осумаголник - macedoni" lang="mk" hreflang="mk" data-title="Осумаголник" data-language-autonym="Македонски" data-language-local-name="macedoni" class="interlanguage-link-target"><span>Македонски</span></a></li><li class="interlanguage-link interwiki-mn mw-list-item"><a href="https://mn.wikipedia.org/wiki/%D0%9D%D0%B0%D0%B9%D0%BC%D0%B0%D0%BD_%D3%A9%D0%BD%D1%86%D3%A9%D0%B3%D1%82" title="Найман өнцөгт - mongol" lang="mn" hreflang="mn" data-title="Найман өнцөгт" data-language-autonym="Монгол" data-language-local-name="mongol" class="interlanguage-link-target"><span>Монгол</span></a></li><li class="interlanguage-link interwiki-ms mw-list-item"><a href="https://ms.wikipedia.org/wiki/Oktagon" title="Oktagon - malai" lang="ms" hreflang="ms" data-title="Oktagon" data-language-autonym="Bahasa Melayu" data-language-local-name="malai" class="interlanguage-link-target"><span>Bahasa Melayu</span></a></li><li class="interlanguage-link interwiki-nl mw-list-item"><a href="https://nl.wikipedia.org/wiki/Achthoek" title="Achthoek - neerlandès" lang="nl" hreflang="nl" data-title="Achthoek" data-language-autonym="Nederlands" data-language-local-name="neerlandès" class="interlanguage-link-target"><span>Nederlands</span></a></li><li class="interlanguage-link interwiki-nn mw-list-item"><a href="https://nn.wikipedia.org/wiki/Oktogon" title="Oktogon - noruec nynorsk" lang="nn" hreflang="nn" data-title="Oktogon" data-language-autonym="Norsk nynorsk" data-language-local-name="noruec nynorsk" class="interlanguage-link-target"><span>Norsk nynorsk</span></a></li><li class="interlanguage-link interwiki-no mw-list-item"><a href="https://no.wikipedia.org/wiki/Oktogon" title="Oktogon - noruec bokmål" lang="nb" hreflang="nb" data-title="Oktogon" data-language-autonym="Norsk bokmål" data-language-local-name="noruec bokmål" class="interlanguage-link-target"><span>Norsk bokmål</span></a></li><li class="interlanguage-link interwiki-or mw-list-item"><a href="https://or.wikipedia.org/wiki/%E0%AC%85%E0%AC%B7%E0%AD%8D%E0%AC%9F%E0%AC%AD%E0%AD%81%E0%AC%9C" title="ଅଷ୍ଟଭୁଜ - oriya" lang="or" hreflang="or" data-title="ଅଷ୍ଟଭୁଜ" data-language-autonym="ଓଡ଼ିଆ" data-language-local-name="oriya" class="interlanguage-link-target"><span>ଓଡ଼ିଆ</span></a></li><li class="interlanguage-link interwiki-pl mw-list-item"><a href="https://pl.wikipedia.org/wiki/O%C5%9Bmiok%C4%85t" title="Ośmiokąt - polonès" lang="pl" hreflang="pl" data-title="Ośmiokąt" data-language-autonym="Polski" data-language-local-name="polonès" class="interlanguage-link-target"><span>Polski</span></a></li><li class="interlanguage-link interwiki-ps mw-list-item"><a href="https://ps.wikipedia.org/wiki/%D8%A7%D8%AA%DA%85%D9%86%DA%89%DB%8C" title="اتڅنډی - paixtu" lang="ps" hreflang="ps" data-title="اتڅنډی" data-language-autonym="پښتو" data-language-local-name="paixtu" class="interlanguage-link-target"><span>پښتو</span></a></li><li class="interlanguage-link interwiki-pt mw-list-item"><a href="https://pt.wikipedia.org/wiki/Oct%C3%B3gono" title="Octógono - portuguès" lang="pt" hreflang="pt" data-title="Octógono" data-language-autonym="Português" data-language-local-name="portuguès" class="interlanguage-link-target"><span>Português</span></a></li><li class="interlanguage-link interwiki-ro mw-list-item"><a href="https://ro.wikipedia.org/wiki/Octogon" title="Octogon - romanès" lang="ro" hreflang="ro" data-title="Octogon" data-language-autonym="Română" data-language-local-name="romanès" class="interlanguage-link-target"><span>Română</span></a></li><li class="interlanguage-link interwiki-ru mw-list-item"><a href="https://ru.wikipedia.org/wiki/%D0%92%D0%BE%D1%81%D1%8C%D0%BC%D0%B8%D1%83%D0%B3%D0%BE%D0%BB%D1%8C%D0%BD%D0%B8%D0%BA" title="Восьмиугольник - rus" lang="ru" hreflang="ru" data-title="Восьмиугольник" data-language-autonym="Русский" data-language-local-name="rus" class="interlanguage-link-target"><span>Русский</span></a></li><li class="interlanguage-link interwiki-sd mw-list-item"><a href="https://sd.wikipedia.org/wiki/%D8%A7%D9%BA%D8%A7%D8%B3" title="اٺاس - sindi" lang="sd" hreflang="sd" data-title="اٺاس" data-language-autonym="سنڌي" data-language-local-name="sindi" class="interlanguage-link-target"><span>سنڌي</span></a></li><li class="interlanguage-link interwiki-simple mw-list-item"><a href="https://simple.wikipedia.org/wiki/Octagon" title="Octagon - Simple English" lang="en-simple" hreflang="en-simple" data-title="Octagon" data-language-autonym="Simple English" data-language-local-name="Simple English" class="interlanguage-link-target"><span>Simple English</span></a></li><li class="interlanguage-link interwiki-sk mw-list-item"><a href="https://sk.wikipedia.org/wiki/Osemuholn%C3%ADk" title="Osemuholník - eslovac" lang="sk" hreflang="sk" data-title="Osemuholník" data-language-autonym="Slovenčina" data-language-local-name="eslovac" class="interlanguage-link-target"><span>Slovenčina</span></a></li><li class="interlanguage-link interwiki-sl mw-list-item"><a href="https://sl.wikipedia.org/wiki/Osemkotnik" title="Osemkotnik - eslovè" lang="sl" hreflang="sl" data-title="Osemkotnik" data-language-autonym="Slovenščina" data-language-local-name="eslovè" class="interlanguage-link-target"><span>Slovenščina</span></a></li><li class="interlanguage-link interwiki-sr mw-list-item"><a href="https://sr.wikipedia.org/wiki/%D0%9E%D1%81%D0%BC%D0%BE%D1%83%D0%B3%D0%B0%D0%BE" title="Осмоугао - serbi" lang="sr" hreflang="sr" data-title="Осмоугао" data-language-autonym="Српски / srpski" data-language-local-name="serbi" class="interlanguage-link-target"><span>Српски / srpski</span></a></li><li class="interlanguage-link interwiki-sv mw-list-item"><a href="https://sv.wikipedia.org/wiki/Oktogon" title="Oktogon - suec" lang="sv" hreflang="sv" data-title="Oktogon" data-language-autonym="Svenska" data-language-local-name="suec" class="interlanguage-link-target"><span>Svenska</span></a></li><li class="interlanguage-link interwiki-ta mw-list-item"><a href="https://ta.wikipedia.org/wiki/%E0%AE%8E%E0%AE%A3%E0%AF%8D%E0%AE%95%E0%AF%8B%E0%AE%A3%E0%AE%AE%E0%AF%8D" title="எண்கோணம் - tàmil" lang="ta" hreflang="ta" data-title="எண்கோணம்" data-language-autonym="தமிழ்" data-language-local-name="tàmil" class="interlanguage-link-target"><span>தமிழ்</span></a></li><li class="interlanguage-link interwiki-th mw-list-item"><a href="https://th.wikipedia.org/wiki/%E0%B8%A3%E0%B8%B9%E0%B8%9B%E0%B9%81%E0%B8%9B%E0%B8%94%E0%B9%80%E0%B8%AB%E0%B8%A5%E0%B8%B5%E0%B9%88%E0%B8%A2%E0%B8%A1" title="รูปแปดเหลี่ยม - tai" lang="th" hreflang="th" data-title="รูปแปดเหลี่ยม" data-language-autonym="ไทย" data-language-local-name="tai" class="interlanguage-link-target"><span>ไทย</span></a></li><li class="interlanguage-link interwiki-tl mw-list-item"><a href="https://tl.wikipedia.org/wiki/Oktagon" title="Oktagon - tagal" lang="tl" hreflang="tl" data-title="Oktagon" data-language-autonym="Tagalog" data-language-local-name="tagal" class="interlanguage-link-target"><span>Tagalog</span></a></li><li class="interlanguage-link interwiki-tr mw-list-item"><a href="https://tr.wikipedia.org/wiki/Sekizgen" title="Sekizgen - turc" lang="tr" hreflang="tr" data-title="Sekizgen" data-language-autonym="Türkçe" data-language-local-name="turc" class="interlanguage-link-target"><span>Türkçe</span></a></li><li class="interlanguage-link interwiki-uk mw-list-item"><a href="https://uk.wikipedia.org/wiki/%D0%92%D0%BE%D1%81%D1%8C%D0%BC%D0%B8%D0%BA%D1%83%D1%82%D0%BD%D0%B8%D0%BA" title="Восьмикутник - ucraïnès" lang="uk" hreflang="uk" data-title="Восьмикутник" data-language-autonym="Українська" data-language-local-name="ucraïnès" class="interlanguage-link-target"><span>Українська</span></a></li><li class="interlanguage-link interwiki-ur mw-list-item"><a href="https://ur.wikipedia.org/wiki/%DB%81%D8%B4%D8%AA_%D8%A7%D8%B6%D9%84%D8%A7%D8%B9" title="ہشت اضلاع - urdú" lang="ur" hreflang="ur" data-title="ہشت اضلاع" data-language-autonym="اردو" data-language-local-name="urdú" class="interlanguage-link-target"><span>اردو</span></a></li><li class="interlanguage-link interwiki-vi mw-list-item"><a href="https://vi.wikipedia.org/wiki/B%C3%A1t_gi%C3%A1c" title="Bát giác - vietnamita" lang="vi" hreflang="vi" data-title="Bát giác" data-language-autonym="Tiếng Việt" data-language-local-name="vietnamita" class="interlanguage-link-target"><span>Tiếng Việt</span></a></li><li class="interlanguage-link interwiki-war mw-list-item"><a href="https://war.wikipedia.org/wiki/Oktagono" title="Oktagono - waray" lang="war" hreflang="war" data-title="Oktagono" data-language-autonym="Winaray" data-language-local-name="waray" class="interlanguage-link-target"><span>Winaray</span></a></li><li class="interlanguage-link interwiki-wuu mw-list-item"><a href="https://wuu.wikipedia.org/wiki/%E5%85%AB%E8%BE%B9%E5%BD%A2" title="八边形 - xinès wu" lang="wuu" hreflang="wuu" data-title="八边形" data-language-autonym="吴语" data-language-local-name="xinès wu" class="interlanguage-link-target"><span>吴语</span></a></li><li class="interlanguage-link interwiki-zh mw-list-item"><a href="https://zh.wikipedia.org/wiki/%E5%85%AB%E8%BE%B9%E5%BD%A2" title="八边形 - xinès" lang="zh" hreflang="zh" data-title="八边形" data-language-autonym="中文" data-language-local-name="xinès" class="interlanguage-link-target"><span>中文</span></a></li><li class="interlanguage-link interwiki-zh-yue mw-list-item"><a href="https://zh-yue.wikipedia.org/wiki/%E5%85%AB%E9%82%8A%E5%BD%A2" title="八邊形 - cantonès" lang="yue" hreflang="yue" data-title="八邊形" data-language-autonym="粵語" data-language-local-name="cantonès" class="interlanguage-link-target"><span>粵語</span></a></li> </ul> <div class="after-portlet after-portlet-lang"><span class="wb-langlinks-edit wb-langlinks-link"><a href="https://www.wikidata.org/wiki/Special:EntityPage/Q166080#sitelinks-wikipedia" title="Modifica enllaços interlingües" class="wbc-editpage">Modifica els enllaços</a></span></div> </div> </div> </div> </header> <div class="vector-page-toolbar"> <div class="vector-page-toolbar-container"> <div id="left-navigation"> <nav aria-label="Espais de noms"> <div id="p-associated-pages" class="vector-menu vector-menu-tabs mw-portlet mw-portlet-associated-pages" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="ca-nstab-main" class="selected vector-tab-noicon mw-list-item"><a href="/wiki/Oct%C3%A0gon" title="Vegeu el contingut de la pàgina [c]" accesskey="c"><span>Pàgina</span></a></li><li id="ca-talk" class="new vector-tab-noicon mw-list-item"><a href="/w/index.php?title=Discussi%C3%B3:Oct%C3%A0gon&action=edit&redlink=1" rel="discussion" class="new" title="Discussió sobre el contingut d'aquesta pàgina (encara no existeix) [t]" accesskey="t"><span>Discussió</span></a></li> </ul> </div> </div> <div id="vector-variants-dropdown" class="vector-dropdown emptyPortlet" > <input type="checkbox" id="vector-variants-dropdown-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-variants-dropdown" class="vector-dropdown-checkbox " aria-label="Canvia la variant de llengua" > <label id="vector-variants-dropdown-label" for="vector-variants-dropdown-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet" aria-hidden="true" ><span class="vector-dropdown-label-text">català</span> </label> <div class="vector-dropdown-content"> <div id="p-variants" class="vector-menu mw-portlet mw-portlet-variants emptyPortlet" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> </ul> </div> </div> </div> </div> </nav> </div> <div id="right-navigation" class="vector-collapsible"> <nav aria-label="Vistes"> <div id="p-views" class="vector-menu vector-menu-tabs mw-portlet mw-portlet-views" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="ca-view" class="selected vector-tab-noicon mw-list-item"><a href="/wiki/Oct%C3%A0gon"><span>Mostra</span></a></li><li id="ca-edit" class="vector-tab-noicon mw-list-item"><a href="/w/index.php?title=Oct%C3%A0gon&action=edit" title="Modifica el codi font d'aquesta pàgina [e]" accesskey="e"><span>Modifica</span></a></li><li id="ca-history" class="vector-tab-noicon mw-list-item"><a href="/w/index.php?title=Oct%C3%A0gon&action=history" title="Versions antigues d'aquesta pàgina [h]" accesskey="h"><span>Mostra l'historial</span></a></li> </ul> </div> </div> </nav> <nav class="vector-page-tools-landmark" aria-label="Eines de la pàgina"> <div id="vector-page-tools-dropdown" class="vector-dropdown vector-page-tools-dropdown" > <input type="checkbox" id="vector-page-tools-dropdown-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-page-tools-dropdown" class="vector-dropdown-checkbox " aria-label="Eines" > <label id="vector-page-tools-dropdown-label" for="vector-page-tools-dropdown-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet" aria-hidden="true" ><span class="vector-dropdown-label-text">Eines</span> </label> <div class="vector-dropdown-content"> <div id="vector-page-tools-unpinned-container" class="vector-unpinned-container"> <div id="vector-page-tools" class="vector-page-tools vector-pinnable-element"> <div class="vector-pinnable-header vector-page-tools-pinnable-header vector-pinnable-header-unpinned" data-feature-name="page-tools-pinned" data-pinnable-element-id="vector-page-tools" data-pinned-container-id="vector-page-tools-pinned-container" data-unpinned-container-id="vector-page-tools-unpinned-container" > <div class="vector-pinnable-header-label">Eines</div> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-pin-button" data-event-name="pinnable-header.vector-page-tools.pin">mou a la barra lateral</button> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-unpin-button" data-event-name="pinnable-header.vector-page-tools.unpin">amaga</button> </div> <div id="p-cactions" class="vector-menu mw-portlet mw-portlet-cactions emptyPortlet vector-has-collapsible-items" title="Més opcions" > <div class="vector-menu-heading"> Accions </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="ca-more-view" class="selected vector-more-collapsible-item mw-list-item"><a href="/wiki/Oct%C3%A0gon"><span>Mostra</span></a></li><li id="ca-more-edit" class="vector-more-collapsible-item mw-list-item"><a href="/w/index.php?title=Oct%C3%A0gon&action=edit" title="Modifica el codi font d'aquesta pàgina [e]" accesskey="e"><span>Modifica</span></a></li><li id="ca-more-history" class="vector-more-collapsible-item mw-list-item"><a href="/w/index.php?title=Oct%C3%A0gon&action=history"><span>Mostra l'historial</span></a></li> </ul> </div> </div> <div id="p-tb" class="vector-menu mw-portlet mw-portlet-tb" > <div class="vector-menu-heading"> General </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="t-whatlinkshere" class="mw-list-item"><a href="/wiki/Especial:Enlla%C3%A7os/Oct%C3%A0gon" title="Una llista de totes les pàgines wiki que enllacen amb aquesta [j]" accesskey="j"><span>Què hi enllaça</span></a></li><li id="t-recentchangeslinked" class="mw-list-item"><a href="/wiki/Especial:Seguiment/Oct%C3%A0gon" rel="nofollow" title="Canvis recents a pàgines enllaçades des d'aquesta pàgina [k]" accesskey="k"><span>Canvis relacionats</span></a></li><li id="t-specialpages" class="mw-list-item"><a href="/wiki/Especial:P%C3%A0gines_especials" title="Llista totes les pàgines especials [q]" accesskey="q"><span>Pàgines especials</span></a></li><li id="t-permalink" class="mw-list-item"><a href="/w/index.php?title=Oct%C3%A0gon&oldid=33583697" title="Enllaç permanent a aquesta revisió de la pàgina"><span>Enllaç permanent</span></a></li><li id="t-info" class="mw-list-item"><a href="/w/index.php?title=Oct%C3%A0gon&action=info" title="Més informació sobre aquesta pàgina"><span>Informació de la pàgina</span></a></li><li id="t-cite" class="mw-list-item"><a href="/w/index.php?title=Especial:Citau&page=Oct%C3%A0gon&id=33583697&wpFormIdentifier=titleform" title="Informació sobre com citar aquesta pàgina"><span>Citau aquest article</span></a></li><li id="t-urlshortener" class="mw-list-item"><a href="/w/index.php?title=Especial:UrlShortener&url=https%3A%2F%2Fca.wikipedia.org%2Fwiki%2FOct%25C3%25A0gon"><span>Obtén una URL abreujada</span></a></li><li id="t-urlshortener-qrcode" class="mw-list-item"><a href="/w/index.php?title=Especial:QrCode&url=https%3A%2F%2Fca.wikipedia.org%2Fwiki%2FOct%25C3%25A0gon"><span>Descarrega el codi QR</span></a></li> </ul> </div> </div> <div id="p-coll-print_export" class="vector-menu mw-portlet mw-portlet-coll-print_export" > <div class="vector-menu-heading"> Imprimeix/exporta </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="coll-create_a_book" class="mw-list-item"><a href="/w/index.php?title=Especial:Llibre&bookcmd=book_creator&referer=Oct%C3%A0gon"><span>Crea un llibre</span></a></li><li id="coll-download-as-rl" class="mw-list-item"><a href="/w/index.php?title=Especial:DownloadAsPdf&page=Oct%C3%A0gon&action=show-download-screen"><span>Baixa com a PDF</span></a></li><li id="t-print" class="mw-list-item"><a href="/w/index.php?title=Oct%C3%A0gon&printable=yes" title="Versió per a impressió d'aquesta pàgina [p]" accesskey="p"><span>Versió per a impressora</span></a></li> </ul> </div> </div> <div id="p-wikibase-otherprojects" class="vector-menu mw-portlet mw-portlet-wikibase-otherprojects" > <div class="vector-menu-heading"> En altres projectes </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li class="wb-otherproject-link wb-otherproject-commons mw-list-item"><a href="https://commons.wikimedia.org/wiki/Category:Octagons" hreflang="en"><span>Commons</span></a></li><li id="t-wikibase" class="wb-otherproject-link wb-otherproject-wikibase-dataitem mw-list-item"><a href="https://www.wikidata.org/wiki/Special:EntityPage/Q166080" title="Enllaç a l'element del repositori de dades connectat [g]" accesskey="g"><span>Element a Wikidata</span></a></li> </ul> </div> </div> </div> </div> </div> </div> </nav> </div> </div> </div> <div class="vector-column-end"> <div class="vector-sticky-pinned-container"> <nav class="vector-page-tools-landmark" aria-label="Eines de la pàgina"> <div id="vector-page-tools-pinned-container" class="vector-pinned-container"> </div> </nav> <nav class="vector-appearance-landmark" aria-label="Aparença"> <div id="vector-appearance-pinned-container" class="vector-pinned-container"> <div id="vector-appearance" class="vector-appearance vector-pinnable-element"> <div class="vector-pinnable-header vector-appearance-pinnable-header vector-pinnable-header-pinned" data-feature-name="appearance-pinned" data-pinnable-element-id="vector-appearance" data-pinned-container-id="vector-appearance-pinned-container" data-unpinned-container-id="vector-appearance-unpinned-container" > <div class="vector-pinnable-header-label">Aparença</div> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-pin-button" data-event-name="pinnable-header.vector-appearance.pin">mou a la barra lateral</button> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-unpin-button" data-event-name="pinnable-header.vector-appearance.unpin">amaga</button> </div> </div> </div> </nav> </div> </div> <div id="bodyContent" class="vector-body" aria-labelledby="firstHeading" data-mw-ve-target-container> <div class="vector-body-before-content"> <div class="mw-indicators"> </div> <div id="siteSub" class="noprint">De la Viquipèdia, l'enciclopèdia lliure</div> </div> <div id="contentSub"><div id="mw-content-subtitle"></div></div> <div id="mw-content-text" class="mw-body-content"><div class="mw-content-ltr mw-parser-output" lang="ca" dir="ltr"><table class="infobox" style="font-size:90%;width:25em"><caption style="font-weight:bold;background:#b0d1ad"><span style="float:left;"><span typeof="mw:File"><span title="Infotaula de polítop"><img alt="Infotaula de polítop" src="//upload.wikimedia.org/wikipedia/commons/thumb/a/ae/Pyramid_icon.svg/22px-Pyramid_icon.svg.png" decoding="async" width="22" height="19" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/a/ae/Pyramid_icon.svg/33px-Pyramid_icon.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/a/ae/Pyramid_icon.svg/44px-Pyramid_icon.svg.png 2x" data-file-width="303" data-file-height="258" /></span></span></span>Octàgon</caption><tbody><tr><td colspan="2" class="infobox-full-data infobox-data" style="text-align:center"><span typeof="mw:File"><a href="/w/index.php?title=Fitxer:Irregular_octagon.svg&lang=ca" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/e/eb/Irregular_octagon.svg/langca-300px-Irregular_octagon.svg.png" decoding="async" width="300" height="300" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/e/eb/Irregular_octagon.svg/langca-450px-Irregular_octagon.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/e/eb/Irregular_octagon.svg/langca-600px-Irregular_octagon.svg.png 2x" data-file-width="392" data-file-height="392" /></a></span></td></tr><tr><th scope="row" class="infobox-label" style="text-align:left;background:#eeeeee">Tipus</th><td class="infobox-data"><a href="/wiki/Pol%C3%ADgon" title="Polígon">polígon</a> i <a href="https://www.wikidata.org/wiki/Special:EntityPage/Q28410543" class="extiw" title="d:Special:EntityPage/Q28410543">octàtop</a> <span class="penicon"><span class="mw-valign-baseline" typeof="mw:File"><a href="https://www.wikidata.org/wiki/Q166080?uselang=ca#P279" title="Modifica el valor a Wikidata"><img alt="Modifica el valor a Wikidata" src="//upload.wikimedia.org/wikipedia/commons/thumb/6/63/Arbcom_ru_editing.svg/10px-Arbcom_ru_editing.svg.png" decoding="async" width="10" height="10" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/6/63/Arbcom_ru_editing.svg/15px-Arbcom_ru_editing.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/6/63/Arbcom_ru_editing.svg/20px-Arbcom_ru_editing.svg.png 2x" data-file-width="600" data-file-height="600" /></a></span></span></td></tr><tr><th scope="row" class="infobox-label" style="text-align:left;background:#eeeeee">Forma de les cares</th><td class="infobox-data"><a href="/wiki/Aresta_(geometria)" title="Aresta (geometria)">aresta</a> (8) <span class="penicon"><span class="mw-valign-baseline" typeof="mw:File"><a href="https://www.wikidata.org/wiki/Q166080?uselang=ca#P1312" title="Modifica el valor a Wikidata"><img alt="Modifica el valor a Wikidata" src="//upload.wikimedia.org/wikipedia/commons/thumb/6/63/Arbcom_ru_editing.svg/10px-Arbcom_ru_editing.svg.png" decoding="async" width="10" height="10" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/6/63/Arbcom_ru_editing.svg/15px-Arbcom_ru_editing.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/6/63/Arbcom_ru_editing.svg/20px-Arbcom_ru_editing.svg.png 2x" data-file-width="600" data-file-height="600" /></a></span></span></td></tr><tr><th scope="row" class="infobox-label" style="text-align:left;background:#eeeeee"><a href="/wiki/Configuraci%C3%B3_de_v%C3%A8rtex" title="Configuració de vèrtex">Configuració de vèrtex</a></th><td class="infobox-data"><a href="/wiki/Segment_lineal" title="Segment lineal">segment</a> <span class="penicon"><span class="mw-valign-baseline" typeof="mw:File"><a href="https://www.wikidata.org/wiki/Q166080?uselang=ca#P1678" title="Modifica el valor a Wikidata"><img alt="Modifica el valor a Wikidata" src="//upload.wikimedia.org/wikipedia/commons/thumb/6/63/Arbcom_ru_editing.svg/10px-Arbcom_ru_editing.svg.png" decoding="async" width="10" height="10" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/6/63/Arbcom_ru_editing.svg/15px-Arbcom_ru_editing.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/6/63/Arbcom_ru_editing.svg/20px-Arbcom_ru_editing.svg.png 2x" data-file-width="600" data-file-height="600" /></a></span></span></td></tr><tr><th colspan="2" class="infobox-header" style="text-align:center;background:#b0d1ad">Elements</th></tr><tr><td colspan="2" class="infobox-full-data infobox-data" style="text-align:center"></td></tr><tr><td style="background:#eeeeee;"><b>Vèrtexs</b></td><td> 8<br /></td></tr><tr><td colspan="2"> </td></tr><tr><td style="background:#eeeeee;"><b>Arestes</b></td><td> 8 <span class="penicon"><span class="mw-valign-baseline" typeof="mw:File"><a href="https://www.wikidata.org/wiki/Q166080?uselang=ca#P2670" title="Modifica el valor a Wikidata"><img alt="Modifica el valor a Wikidata" src="//upload.wikimedia.org/wikipedia/commons/thumb/6/63/Arbcom_ru_editing.svg/10px-Arbcom_ru_editing.svg.png" decoding="async" width="10" height="10" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/6/63/Arbcom_ru_editing.svg/15px-Arbcom_ru_editing.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/6/63/Arbcom_ru_editing.svg/20px-Arbcom_ru_editing.svg.png 2x" data-file-width="600" data-file-height="600" /></a></span></span></td></tr><tr><th colspan="2" class="infobox-header" style="text-align:center;background:#b0d1ad">Sèrie</th></tr><tr><td colspan="2" class="infobox-full-data infobox-data" style="text-align:center"><div style="float: left;">← <a href="/wiki/Hept%C3%A0gon" title="Heptàgon">heptàgon</a> <span class="penicon"><span class="mw-valign-baseline" typeof="mw:File"><a href="https://www.wikidata.org/wiki/Q166080?uselang=ca#P155" title="Modifica el valor a Wikidata"><img alt="Modifica el valor a Wikidata" src="//upload.wikimedia.org/wikipedia/commons/thumb/6/63/Arbcom_ru_editing.svg/10px-Arbcom_ru_editing.svg.png" decoding="async" width="10" height="10" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/6/63/Arbcom_ru_editing.svg/15px-Arbcom_ru_editing.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/6/63/Arbcom_ru_editing.svg/20px-Arbcom_ru_editing.svg.png 2x" data-file-width="600" data-file-height="600" /></a></span></span> </div><div style="float: right;"><a href="/wiki/Enne%C3%A0gon" title="Enneàgon">enneàgon</a> <span class="penicon"><span class="mw-valign-baseline" typeof="mw:File"><a href="https://www.wikidata.org/wiki/Q166080?uselang=ca#P156" title="Modifica el valor a Wikidata"><img alt="Modifica el valor a Wikidata" src="//upload.wikimedia.org/wikipedia/commons/thumb/6/63/Arbcom_ru_editing.svg/10px-Arbcom_ru_editing.svg.png" decoding="async" width="10" height="10" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/6/63/Arbcom_ru_editing.svg/15px-Arbcom_ru_editing.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/6/63/Arbcom_ru_editing.svg/20px-Arbcom_ru_editing.svg.png 2x" data-file-width="600" data-file-height="600" /></a></span></span> →</div></td></tr><tr><th colspan="2" class="infobox-header" style="text-align:center;background:#b0d1ad">Més informació</th></tr><tr><th scope="row" class="infobox-label" style="text-align:left;background:#eeeeee"><a href="/wiki/MathWorld" title="MathWorld">MathWorld</a></th><td class="infobox-data"><a rel="nofollow" class="external text" href="http://mathworld.wolfram.com/Octagon.html">Octagon</a> <span class="penicon"><span class="mw-valign-baseline" typeof="mw:File"><a href="https://www.wikidata.org/wiki/Q166080?uselang=ca#P2812" title="Modifica el valor a Wikidata"><img alt="Modifica el valor a Wikidata" src="//upload.wikimedia.org/wikipedia/commons/thumb/6/63/Arbcom_ru_editing.svg/10px-Arbcom_ru_editing.svg.png" decoding="async" width="10" height="10" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/6/63/Arbcom_ru_editing.svg/15px-Arbcom_ru_editing.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/6/63/Arbcom_ru_editing.svg/20px-Arbcom_ru_editing.svg.png 2x" data-file-width="600" data-file-height="600" /></a></span></span></td></tr></tbody></table> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/Fitxer:08-L_Oct%C3%B3gono.svg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/d/d9/08-L_Oct%C3%B3gono.svg/220px-08-L_Oct%C3%B3gono.svg.png" decoding="async" width="220" height="220" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/d/d9/08-L_Oct%C3%B3gono.svg/330px-08-L_Oct%C3%B3gono.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/d/d9/08-L_Oct%C3%B3gono.svg/440px-08-L_Oct%C3%B3gono.svg.png 2x" data-file-width="400" data-file-height="400" /></a><figcaption>Octàgon regular</figcaption></figure> <p>En <a href="/wiki/Geometria" title="Geometria">geometria</a>, un <b>octàgon</b> és un <a href="/wiki/Pol%C3%ADgon" title="Polígon">polígon</a> amb vuit costats i vuit angles.<sup id="cite_ref-1" class="reference"><a href="#cite_note-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> El nom prové del del grec ὀκτάγωνον via el llatí.<sup id="cite_ref-2" class="reference"><a href="#cite_note-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup> Un octàgon té 20 <a href="/wiki/Diagonal" title="Diagonal">diagonals</a> i la suma de tots els <a href="/wiki/Angle_interior" title="Angle interior">angles interiors</a> és 1080 <a href="/wiki/Grau_sexagesimal" title="Grau sexagesimal">graus</a> o <span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle 6\pi }"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mn>6</mn> <mi>π</mi> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle 6\pi }</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/1130d554b39b24208a99af0594da0ac9e177aa41" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.338ex; width:2.494ex; height:2.176ex;" alt="{\displaystyle 6\pi }"></span> <a href="/wiki/Radian" title="Radian">radians</a>. </p> <meta property="mw:PageProp/toc" /> <div class="mw-heading mw-heading2"><h2 id="Octàgon_regular"><span id="Oct.C3.A0gon_regular"></span>Octàgon regular</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Oct%C3%A0gon&action=edit&section=1" title="Modifica la secció: Octàgon regular"><span>modifica</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/Fitxer:OctagonConstructionAni.gif" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/b/bb/OctagonConstructionAni.gif" decoding="async" width="217" height="222" class="mw-file-element" data-file-width="217" data-file-height="222" /></a><figcaption>La construcció d'un octàgon regular amb <a href="/wiki/Construcci%C3%B3_amb_regle_i_comp%C3%A0s" title="Construcció amb regle i compàs">regle i compàs</a> és possible. L'animació mostra com fer-la, seguint els passos de l'1 fins al 18, i tenint en compte que el radi del compàs no varia entre els passos 7 i 10.</figcaption></figure> <p>En un octàgon <a href="/wiki/Pol%C3%ADgon_regular" class="mw-redirect" title="Polígon regular">regular</a>, tots els costats i angles del qual són iguals. Els costats s'uneixen formant un angle de 135º o <span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle 3\pi /4}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mn>3</mn> <mi>π</mi> <mrow class="MJX-TeXAtom-ORD"> <mo>/</mo> </mrow> <mn>4</mn> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle 3\pi /4}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/0e9ab018f07a37399079967b3e38116975973781" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.838ex; width:4.819ex; height:2.843ex;" alt="{\displaystyle 3\pi /4}"></span> rad. Cada <a href="/wiki/Angle_exterior" title="Angle exterior">angle exterior</a> és de 45° o <span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle \pi /4}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi>π</mi> <mrow class="MJX-TeXAtom-ORD"> <mo>/</mo> </mrow> <mn>4</mn> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle \pi /4}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/1707aa0fec2c8ef008b9e30b6045fbf95dab9e20" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.838ex; width:3.657ex; height:2.843ex;" alt="{\displaystyle \pi /4}"></span> rad. </p> <div class="mw-heading mw-heading3"><h3 id="Perímetre"><span id="Per.C3.ADmetre"></span>Perímetre</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Oct%C3%A0gon&action=edit&section=2" title="Modifica la secció: Perímetre"><span>modifica</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>El <a href="/wiki/Per%C3%ADmetre" title="Perímetre">perímetre</a> de l'octàgon regular de costat <span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle L}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi>L</mi> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle L}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/103168b86f781fe6e9a4a87b8ea1cebe0ad4ede8" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.338ex; width:1.583ex; height:2.176ex;" alt="{\displaystyle L}"></span> és </p> <dl><dd><span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle P=6\cdot L}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi>P</mi> <mo>=</mo> <mn>6</mn> <mo>⋅</mo> <mi>L</mi> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle P=6\cdot L}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/7acff2a69fd63b21f21a19098684413c83ed9ac3" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.338ex; width:9.268ex; height:2.176ex;" alt="{\displaystyle P=6\cdot L}"></span></dd></dl> <p>O bé, en funció de l'<a href="/wiki/Apotema" title="Apotema">apotema</a>, <span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle a_{p}}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <msub> <mi>a</mi> <mrow class="MJX-TeXAtom-ORD"> <mi>p</mi> </mrow> </msub> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle a_{p}}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/d3a5f11f304b2976ca9d33d1575c148e791728e7" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -1.005ex; width:2.289ex; height:2.343ex;" alt="{\displaystyle a_{p}}"></span>,<sup id="cite_ref-pye_3-0" class="reference"><a href="#cite_note-pye-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup> </p> <dl><dd><span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle P=16\cdot a_{p}\cdot {\frac {\sin(22.5^{\circ })}{\sin(67.5^{\circ })}}=16\cdot a_{p}\cdot \tan(\pi /8)\approx a_{p}\cdot 6.62747}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi>P</mi> <mo>=</mo> <mn>16</mn> <mo>⋅</mo> <msub> <mi>a</mi> <mrow class="MJX-TeXAtom-ORD"> <mi>p</mi> </mrow> </msub> <mo>⋅</mo> <mrow class="MJX-TeXAtom-ORD"> <mfrac> <mrow> <mi>sin</mi> <mo>⁡</mo> <mo stretchy="false">(</mo> <msup> <mn>22.5</mn> <mrow class="MJX-TeXAtom-ORD"> <mo>∘</mo> </mrow> </msup> <mo stretchy="false">)</mo> </mrow> <mrow> <mi>sin</mi> <mo>⁡</mo> <mo stretchy="false">(</mo> <msup> <mn>67.5</mn> <mrow class="MJX-TeXAtom-ORD"> <mo>∘</mo> </mrow> </msup> <mo stretchy="false">)</mo> </mrow> </mfrac> </mrow> <mo>=</mo> <mn>16</mn> <mo>⋅</mo> <msub> <mi>a</mi> <mrow class="MJX-TeXAtom-ORD"> <mi>p</mi> </mrow> </msub> <mo>⋅</mo> <mi>tan</mi> <mo>⁡</mo> <mo stretchy="false">(</mo> <mi>π</mi> <mrow class="MJX-TeXAtom-ORD"> <mo>/</mo> </mrow> <mn>8</mn> <mo stretchy="false">)</mo> <mo>≈</mo> <msub> <mi>a</mi> <mrow class="MJX-TeXAtom-ORD"> <mi>p</mi> </mrow> </msub> <mo>⋅</mo> <mn>6.62747</mn> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle P=16\cdot a_{p}\cdot {\frac {\sin(22.5^{\circ })}{\sin(67.5^{\circ })}}=16\cdot a_{p}\cdot \tan(\pi /8)\approx a_{p}\cdot 6.62747}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/1f3458ebd03708d8bb41ca31264f3ffd73fda084" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -2.671ex; width:58.09ex; height:6.509ex;" alt="{\displaystyle P=16\cdot a_{p}\cdot {\frac {\sin(22.5^{\circ })}{\sin(67.5^{\circ })}}=16\cdot a_{p}\cdot \tan(\pi /8)\approx a_{p}\cdot 6.62747}"></span></dd></dl> <div class="mw-heading mw-heading3"><h3 id="Apotema">Apotema</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Oct%C3%A0gon&action=edit&section=3" title="Modifica la secció: Apotema"><span>modifica</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>L'apotema de l'octàgon regular de costat <span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle L}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi>L</mi> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle L}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/103168b86f781fe6e9a4a87b8ea1cebe0ad4ede8" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.338ex; width:1.583ex; height:2.176ex;" alt="{\displaystyle L}"></span> és <sup id="cite_ref-pye_3-1" class="reference"><a href="#cite_note-pye-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup> </p> <dl><dd><span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle a_{p}={\frac {L}{2}}\cdot {\frac {\sin(67.5^{\circ })}{\sin(22.5^{\circ })}}={\frac {L}{2}}\cdot \cot(\pi /8)\approx L\cdot 1.20711}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <msub> <mi>a</mi> <mrow class="MJX-TeXAtom-ORD"> <mi>p</mi> </mrow> </msub> <mo>=</mo> <mrow class="MJX-TeXAtom-ORD"> <mfrac> <mi>L</mi> <mn>2</mn> </mfrac> </mrow> <mo>⋅</mo> <mrow class="MJX-TeXAtom-ORD"> <mfrac> <mrow> <mi>sin</mi> <mo>⁡</mo> <mo stretchy="false">(</mo> <msup> <mn>67.5</mn> <mrow class="MJX-TeXAtom-ORD"> <mo>∘</mo> </mrow> </msup> <mo stretchy="false">)</mo> </mrow> <mrow> <mi>sin</mi> <mo>⁡</mo> <mo stretchy="false">(</mo> <msup> <mn>22.5</mn> <mrow class="MJX-TeXAtom-ORD"> <mo>∘</mo> </mrow> </msup> <mo stretchy="false">)</mo> </mrow> </mfrac> </mrow> <mo>=</mo> <mrow class="MJX-TeXAtom-ORD"> <mfrac> <mi>L</mi> <mn>2</mn> </mfrac> </mrow> <mo>⋅</mo> <mi>cot</mi> <mo>⁡</mo> <mo stretchy="false">(</mo> <mi>π</mi> <mrow class="MJX-TeXAtom-ORD"> <mo>/</mo> </mrow> <mn>8</mn> <mo stretchy="false">)</mo> <mo>≈</mo> <mi>L</mi> <mo>⋅</mo> <mn>1.20711</mn> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle a_{p}={\frac {L}{2}}\cdot {\frac {\sin(67.5^{\circ })}{\sin(22.5^{\circ })}}={\frac {L}{2}}\cdot \cot(\pi /8)\approx L\cdot 1.20711}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/77ddaa7f9384f502596f0f245cd6f5e3be1ef74a" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -2.671ex; width:49.919ex; height:6.509ex;" alt="{\displaystyle a_{p}={\frac {L}{2}}\cdot {\frac {\sin(67.5^{\circ })}{\sin(22.5^{\circ })}}={\frac {L}{2}}\cdot \cot(\pi /8)\approx L\cdot 1.20711}"></span></dd></dl> <div class="mw-heading mw-heading3"><h3 id="Àrea"><span id=".C3.80rea"></span>Àrea</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Oct%C3%A0gon&action=edit&section=4" title="Modifica la secció: Àrea"><span>modifica</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>L'<a href="/wiki/%C3%80rea" title="Àrea">àrea</a> de l'octàgon regular de costat <span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle L}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi>L</mi> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle L}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/103168b86f781fe6e9a4a87b8ea1cebe0ad4ede8" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.338ex; width:1.583ex; height:2.176ex;" alt="{\displaystyle L}"></span> i apotema <span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle a_{p}}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <msub> <mi>a</mi> <mrow class="MJX-TeXAtom-ORD"> <mi>p</mi> </mrow> </msub> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle a_{p}}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/d3a5f11f304b2976ca9d33d1575c148e791728e7" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -1.005ex; width:2.289ex; height:2.343ex;" alt="{\displaystyle a_{p}}"></span> és </p> <dl><dd><span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle A=4\cdot a_{p}\cdot L}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi>A</mi> <mo>=</mo> <mn>4</mn> <mo>⋅</mo> <msub> <mi>a</mi> <mrow class="MJX-TeXAtom-ORD"> <mi>p</mi> </mrow> </msub> <mo>⋅</mo> <mi>L</mi> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle A=4\cdot a_{p}\cdot L}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/5eb0ee67dc97d665886ea0dad5f65e58fd79a654" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -1.005ex; width:13.234ex; height:2.843ex;" alt="{\displaystyle A=4\cdot a_{p}\cdot L}"></span></dd></dl> <p>O bé, només en funció del costat, <span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle L}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi>L</mi> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle L}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/103168b86f781fe6e9a4a87b8ea1cebe0ad4ede8" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.338ex; width:1.583ex; height:2.176ex;" alt="{\displaystyle L}"></span>,<sup id="cite_ref-pye_3-2" class="reference"><a href="#cite_note-pye-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup> </p> <dl><dd><span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle A=2\cdot L^{2}\cdot {\frac {\sin(67.5^{\circ })}{\sin(22.5^{\circ })}}=2\cdot L^{2}\cdot \cot(\pi /8)\approx L^{2}\cdot 4.82843}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi>A</mi> <mo>=</mo> <mn>2</mn> <mo>⋅</mo> <msup> <mi>L</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>2</mn> </mrow> </msup> <mo>⋅</mo> <mrow class="MJX-TeXAtom-ORD"> <mfrac> <mrow> <mi>sin</mi> <mo>⁡</mo> <mo stretchy="false">(</mo> <msup> <mn>67.5</mn> <mrow class="MJX-TeXAtom-ORD"> <mo>∘</mo> </mrow> </msup> <mo stretchy="false">)</mo> </mrow> <mrow> <mi>sin</mi> <mo>⁡</mo> <mo stretchy="false">(</mo> <msup> <mn>22.5</mn> <mrow class="MJX-TeXAtom-ORD"> <mo>∘</mo> </mrow> </msup> <mo stretchy="false">)</mo> </mrow> </mfrac> </mrow> <mo>=</mo> <mn>2</mn> <mo>⋅</mo> <msup> <mi>L</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>2</mn> </mrow> </msup> <mo>⋅</mo> <mi>cot</mi> <mo>⁡</mo> <mo stretchy="false">(</mo> <mi>π</mi> <mrow class="MJX-TeXAtom-ORD"> <mo>/</mo> </mrow> <mn>8</mn> <mo stretchy="false">)</mo> <mo>≈</mo> <msup> <mi>L</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>2</mn> </mrow> </msup> <mo>⋅</mo> <mn>4.82843</mn> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle A=2\cdot L^{2}\cdot {\frac {\sin(67.5^{\circ })}{\sin(22.5^{\circ })}}=2\cdot L^{2}\cdot \cot(\pi /8)\approx L^{2}\cdot 4.82843}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/fd8b24e4758485d10ce4cfe700d3aab4ea3d9d6f" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -2.671ex; width:56.547ex; height:6.509ex;" alt="{\displaystyle A=2\cdot L^{2}\cdot {\frac {\sin(67.5^{\circ })}{\sin(22.5^{\circ })}}=2\cdot L^{2}\cdot \cot(\pi /8)\approx L^{2}\cdot 4.82843}"></span></dd></dl> <p>O també, només en funció de l'apotema, <span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle a_{p}}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <msub> <mi>a</mi> <mrow class="MJX-TeXAtom-ORD"> <mi>p</mi> </mrow> </msub> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle a_{p}}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/d3a5f11f304b2976ca9d33d1575c148e791728e7" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -1.005ex; width:2.289ex; height:2.343ex;" alt="{\displaystyle a_{p}}"></span>,<sup id="cite_ref-pye_3-3" class="reference"><a href="#cite_note-pye-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup> </p> <dl><dd><span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle A=8\cdot a_{p}^{2}\cdot {\frac {\sin(22.5^{\circ })}{\sin(67.5^{\circ })}}=8\cdot a_{p}^{2}\cdot \tan(\pi /8)\approx a_{p}^{2}\cdot 3.31371}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi>A</mi> <mo>=</mo> <mn>8</mn> <mo>⋅</mo> <msubsup> <mi>a</mi> <mrow class="MJX-TeXAtom-ORD"> <mi>p</mi> </mrow> <mrow class="MJX-TeXAtom-ORD"> <mn>2</mn> </mrow> </msubsup> <mo>⋅</mo> <mrow class="MJX-TeXAtom-ORD"> <mfrac> <mrow> <mi>sin</mi> <mo>⁡</mo> <mo stretchy="false">(</mo> <msup> <mn>22.5</mn> <mrow class="MJX-TeXAtom-ORD"> <mo>∘</mo> </mrow> </msup> <mo stretchy="false">)</mo> </mrow> <mrow> <mi>sin</mi> <mo>⁡</mo> <mo stretchy="false">(</mo> <msup> <mn>67.5</mn> <mrow class="MJX-TeXAtom-ORD"> <mo>∘</mo> </mrow> </msup> <mo stretchy="false">)</mo> </mrow> </mfrac> </mrow> <mo>=</mo> <mn>8</mn> <mo>⋅</mo> <msubsup> <mi>a</mi> <mrow class="MJX-TeXAtom-ORD"> <mi>p</mi> </mrow> <mrow class="MJX-TeXAtom-ORD"> <mn>2</mn> </mrow> </msubsup> <mo>⋅</mo> <mi>tan</mi> <mo>⁡</mo> <mo stretchy="false">(</mo> <mi>π</mi> <mrow class="MJX-TeXAtom-ORD"> <mo>/</mo> </mrow> <mn>8</mn> <mo stretchy="false">)</mo> <mo>≈</mo> <msubsup> <mi>a</mi> <mrow class="MJX-TeXAtom-ORD"> <mi>p</mi> </mrow> <mrow class="MJX-TeXAtom-ORD"> <mn>2</mn> </mrow> </msubsup> <mo>⋅</mo> <mn>3.31371</mn> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle A=8\cdot a_{p}^{2}\cdot {\frac {\sin(22.5^{\circ })}{\sin(67.5^{\circ })}}=8\cdot a_{p}^{2}\cdot \tan(\pi /8)\approx a_{p}^{2}\cdot 3.31371}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/a46b9749a6ea72018d22865b60befe70db932ada" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -2.671ex; width:55.763ex; height:6.509ex;" alt="{\displaystyle A=8\cdot a_{p}^{2}\cdot {\frac {\sin(22.5^{\circ })}{\sin(67.5^{\circ })}}=8\cdot a_{p}^{2}\cdot \tan(\pi /8)\approx a_{p}^{2}\cdot 3.31371}"></span></dd></dl> <p><br /> L'octàgon regular té <a href="/wiki/S%C3%ADmbol_de_Schl%C3%A4fli" title="Símbol de Schläfli">símbol de Schläfli</a> {8}.<sup id="cite_ref-4" class="reference"><a href="#cite_note-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="Al_dia_a_dia">Al dia a dia</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Oct%C3%A0gon&action=edit&section=5" title="Modifica la secció: Al dia a dia"><span>modifica</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul class="gallery mw-gallery-traditional"> <li class="gallerybox" style="width: 155px"> <div class="thumb" style="width: 150px; height: 150px;"><span typeof="mw:File"><a href="/wiki/Fitxer:Zont_8_ugolnik.jpg" class="mw-file-description" title="Els paraigües solen tenir forma vuitavada."><img alt="Els paraigües solen tenir forma vuitavada." src="//upload.wikimedia.org/wikipedia/commons/thumb/5/5a/Zont_8_ugolnik.jpg/120px-Zont_8_ugolnik.jpg" decoding="async" width="120" height="108" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/5/5a/Zont_8_ugolnik.jpg/180px-Zont_8_ugolnik.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/5/5a/Zont_8_ugolnik.jpg/240px-Zont_8_ugolnik.jpg 2x" data-file-width="1712" data-file-height="1536" /></a></span></div> <div class="gallerytext">Els <a href="/wiki/Paraigua" title="Paraigua">paraigües</a> solen tenir forma vuitavada.</div> </li> </ul> <div class="mw-heading mw-heading2"><h2 id="Figures_geomètriques_derivades"><span id="Figures_geom.C3.A8triques_derivades"></span>Figures geomètriques derivades</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Oct%C3%A0gon&action=edit&section=6" title="Modifica la secció: Figures geomètriques derivades"><span>modifica</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul class="gallery mw-gallery-traditional"> <li class="gallerybox" style="width: 155px"> <div class="thumb" style="width: 150px; height: 150px;"><span typeof="mw:File"><a href="/wiki/Fitxer:Octagram.svg" class="mw-file-description" title="El polígon estrellat de 8 vèrtexs anomenat octagram, {8/3} en símbol de Schläfli, està comprès per un octàgon regular."><img alt="El polígon estrellat de 8 vèrtexs anomenat octagram, {8/3} en símbol de Schläfli, està comprès per un octàgon regular." src="//upload.wikimedia.org/wikipedia/commons/thumb/f/f1/Octagram.svg/120px-Octagram.svg.png" decoding="async" width="120" height="120" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/f/f1/Octagram.svg/180px-Octagram.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/f/f1/Octagram.svg/240px-Octagram.svg.png 2x" data-file-width="874" data-file-height="874" /></a></span></div> <div class="gallerytext">El <a href="/wiki/Pol%C3%ADgon_estrellat" class="mw-redirect" title="Polígon estrellat">polígon estrellat</a> de 8 vèrtexs anomenat <i>octagram</i>, {8/3} en símbol de Schläfli, està comprès per un octàgon regular.</div> </li> <li class="gallerybox" style="width: 155px"> <div class="thumb" style="width: 150px; height: 150px;"><span typeof="mw:File"><a href="/wiki/Fitxer:Great_dirhombicosidodecahedron_vertfig.png" class="mw-file-description" title="La figura de vèrtex del políedre uniforme, gran dirhombicosidodecaèdre té la forma d'octagon irregular."><img alt="La figura de vèrtex del políedre uniforme, gran dirhombicosidodecaèdre té la forma d'octagon irregular." src="//upload.wikimedia.org/wikipedia/commons/thumb/e/e2/Great_dirhombicosidodecahedron_vertfig.png/120px-Great_dirhombicosidodecahedron_vertfig.png" decoding="async" width="120" height="120" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/e/e2/Great_dirhombicosidodecahedron_vertfig.png/180px-Great_dirhombicosidodecahedron_vertfig.png 1.5x, //upload.wikimedia.org/wikipedia/commons/e/e2/Great_dirhombicosidodecahedron_vertfig.png 2x" data-file-width="230" data-file-height="230" /></a></span></div> <div class="gallerytext">La <a href="/wiki/Figura_de_v%C3%A8rtex" title="Figura de vèrtex">figura de vèrtex</a> del <a href="/wiki/Pol%C3%ADedre_uniforme" title="Políedre uniforme">políedre uniforme</a>, <a href="/w/index.php?title=Gran_dirhombicosidodeca%C3%A8dre&action=edit&redlink=1" class="new" title="Gran dirhombicosidodecaèdre (encara no existeix)">gran dirhombicosidodecaèdre</a> té la forma d'octagon <a href="/w/index.php?title=Irregular&action=edit&redlink=1" class="new" title="Irregular (encara no existeix)">irregular</a>.</div> </li> <li class="gallerybox" style="width: 155px"> <div class="thumb" style="width: 150px; height: 150px;"><span typeof="mw:File"><a href="/wiki/Fitxer:Octagonal_prism.png" class="mw-file-description" title="Les bases d'un prisma octagonal són octàgons."><img alt="Les bases d'un prisma octagonal són octàgons." src="//upload.wikimedia.org/wikipedia/commons/thumb/5/59/Octagonal_prism.png/120px-Octagonal_prism.png" decoding="async" width="120" height="94" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/5/59/Octagonal_prism.png/180px-Octagonal_prism.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/5/59/Octagonal_prism.png/240px-Octagonal_prism.png 2x" data-file-width="986" data-file-height="775" /></a></span></div> <div class="gallerytext">Les bases d'un <a href="/w/index.php?title=Prisma_octagonal&action=edit&redlink=1" class="new" title="Prisma octagonal (encara no existeix)">prisma octagonal</a> són octàgons.</div> </li> <li class="gallerybox" style="width: 155px"> <div class="thumb" style="width: 150px; height: 150px;"><span typeof="mw:File"><a href="/wiki/Fitxer:Tiling_Semiregular_4-8-8_Truncated_Square.svg" class="mw-file-description" title="Un mosaic amb dos octàgons a cada vèrtex."><img alt="Un mosaic amb dos octàgons a cada vèrtex." src="//upload.wikimedia.org/wikipedia/commons/thumb/e/e1/Tiling_Semiregular_4-8-8_Truncated_Square.svg/120px-Tiling_Semiregular_4-8-8_Truncated_Square.svg.png" decoding="async" width="120" height="120" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/e/e1/Tiling_Semiregular_4-8-8_Truncated_Square.svg/180px-Tiling_Semiregular_4-8-8_Truncated_Square.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/e/e1/Tiling_Semiregular_4-8-8_Truncated_Square.svg/240px-Tiling_Semiregular_4-8-8_Truncated_Square.svg.png 2x" data-file-width="400" data-file-height="400" /></a></span></div> <div class="gallerytext">Un <a href="/wiki/Mosaic" title="Mosaic">mosaic</a> amb dos octàgons a cada vèrtex.</div> </li> <li class="gallerybox" style="width: 155px"> <div class="thumb" style="width: 150px; height: 150px;"><span typeof="mw:File"><a href="/wiki/Fitxer:Great_rhombicuboctahedron.png" class="mw-file-description" title="El cuboctàedre truncat conté 6 cares octagonals."><img alt="El cuboctàedre truncat conté 6 cares octagonals." src="//upload.wikimedia.org/wikipedia/commons/thumb/c/c8/Great_rhombicuboctahedron.png/120px-Great_rhombicuboctahedron.png" decoding="async" width="120" height="120" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/c/c8/Great_rhombicuboctahedron.png/180px-Great_rhombicuboctahedron.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/c/c8/Great_rhombicuboctahedron.png/240px-Great_rhombicuboctahedron.png 2x" data-file-width="1000" data-file-height="1000" /></a></span></div> <div class="gallerytext">El <a href="/wiki/Cuboct%C3%A0edre_truncat" title="Cuboctàedre truncat">cuboctàedre truncat</a> conté 6 cares octagonals.</div> </li> <li class="gallerybox" style="width: 155px"> <div class="thumb" style="width: 150px; height: 150px;"><span typeof="mw:File"><a href="/wiki/Fitxer:Octagonal_antiprism.png" class="mw-file-description" title="Les bases d'un antiprisma octagonal són octàgons."><img alt="Les bases d'un antiprisma octagonal són octàgons." src="//upload.wikimedia.org/wikipedia/commons/thumb/b/b5/Octagonal_antiprism.png/120px-Octagonal_antiprism.png" decoding="async" width="120" height="120" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/b/b5/Octagonal_antiprism.png/180px-Octagonal_antiprism.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/b/b5/Octagonal_antiprism.png/240px-Octagonal_antiprism.png 2x" data-file-width="1000" data-file-height="1000" /></a></span></div> <div class="gallerytext">Les bases d'un <a href="/w/index.php?title=Antiprisma_octagonal&action=edit&redlink=1" class="new" title="Antiprisma octagonal (encara no existeix)">antiprisma octagonal</a> són octàgons.</div> </li> </ul> <div class="mw-heading mw-heading2"><h2 id="Referències"><span id="Refer.C3.A8ncies"></span>Referències</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Oct%C3%A0gon&action=edit&section=7" title="Modifica la secció: Referències"><span>modifica</span></a><span class="mw-editsection-bracket">]</span></span></div> <div class="reflist {{#if: | references-column-count references-column-count-{{{col}}}" style="list-style-type: decimal;"> <div class="mw-references-wrap"><ol class="references"> <li id="cite_note-1"><span class="mw-cite-backlink"><a href="#cite_ref-1">↑</a></span> <span class="reference-text"><span class="citation" style="font-style:normal">«<a rel="nofollow" class="external text" href="https://www.diccionari.cat/cerca/gran-diccionari-de-la-llengua-catalana?search_api_fulltext_cust=oct%C3%A0gon">octàgon</a>». <i><a href="/wiki/Gran_Diccionari_de_la_Llengua_Catalana" title="Gran Diccionari de la Llengua Catalana">Gran Diccionari de la Llengua Catalana</a></i>.  Barcelona:  <a href="/wiki/Grup_Enciclop%C3%A8dia_Catalana" class="mw-redirect" title="Grup Enciclopèdia Catalana">Grup Enciclopèdia Catalana</a>.</span></span> </li> <li id="cite_note-2"><span class="mw-cite-backlink"><a href="#cite_ref-2">↑</a></span> <span class="reference-text"><span class="citation book" style="font-style:normal" id="CITEREFBrugueraFluvià_i_Figueras1996"><a href="/wiki/Jordi_Bruguera_i_Talleda" title="Jordi Bruguera i Talleda"><span style="font-variant: small-caps;">Bruguera</span>, Jordi</a>; <span style="font-variant: small-caps;">Fluvià i Figueras</span>, Assumpta. «octàgon». A: <i>Diccionari etimològic</i>. 4a edició 2004.  Barcelona: Grup Enciclopèdia, 1996, p. 648. <span style="font-size:90%; white-space:nowrap;"><a href="/wiki/Especial:Fonts_bibliogr%C3%A0fiques/9788441225169" title="Especial:Fonts bibliogràfiques/9788441225169">ISBN 9788441225169</a></span>.</span><span class="Z3988" title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=Diccionari+etimol%C3%B2gic&rft.atitle=oct%C3%A0gon&rft.aulast=Bruguera&rft.aufirst=Jordi&rft.date=1996&rft.edition=4a+edici%C3%B3+2004&rft.pub=Grup+Enciclop%C3%A8dia&rft.place=Barcelona&rft.pages=648&rft.isbn=9788441225169"><span style="display: none;"> </span></span></span> </li> <li id="cite_note-pye-3"><span class="mw-cite-backlink">↑ <sup><a href="#cite_ref-pye_3-0">3,0</a></sup> <sup><a href="#cite_ref-pye_3-1">3,1</a></sup> <sup><a href="#cite_ref-pye_3-2">3,2</a></sup> <sup><a href="#cite_ref-pye_3-3">3,3</a></sup></span> <span class="reference-text"><span class="citation" style="font-style:normal"><span style="font-variant: small-caps;">Sapiña</span>, R. «<a rel="nofollow" class="external text" href="https://www.problemasyecuaciones.com/geometria2D/area/poligono/octagono/calculadora-area-perimetro-formulas.html">Calculadora de l'àrea i perímetre de l'octàgon regular</a>» (en castellà). <i><a rel="nofollow" class="external text" href="https://www.problemasyecuaciones.com/">Problemas y ecuaciones</a></i>. <a href="/wiki/ISSN" title="ISSN">ISSN</a>: <a rel="nofollow" class="external text" href="//www.worldcat.org/issn/2659-9899">2659-9899</a> [Consulta: 16 juliol 2020].</span></span> </li> <li id="cite_note-4"><span class="mw-cite-backlink"><a href="#cite_ref-4">↑</a></span> <span class="reference-text"><span class="citation book" style="font-style:normal" id="CITEREFWenninger1974"><a href="/wiki/Magnus_Wenninger" title="Magnus Wenninger"><span style="font-variant: small-caps;">Wenninger</span>, Magnus J.</a> Cambridge University Press. <a rel="nofollow" class="external text" href="https://books.google.cat/books?id=N8lX2T-4njIC&pg=PA9"><i>Models de políedres</i></a> (en anglès), 1974, p. 9. <span style="font-size:90%; white-space:nowrap;"><a href="/wiki/Especial:Fonts_bibliogr%C3%A0fiques/9780521098595" title="Especial:Fonts bibliogràfiques/9780521098595">ISBN 9780521098595</a></span>.</span><span class="Z3988" title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=Models+de+pol%C3%ADedres&rft.aulast=Wenninger&rft.aufirst=Magnus+J.&rft.date=1974&rft.pages=9&rft.isbn=9780521098595&rft_id=https%3A%2F%2Fbooks.google.cat%2Fbooks%3Fid%3DN8lX2T-4njIC%26pg%3DPA9"><span style="display: none;"> </span></span></span> </li> </ol></div></div> <style data-mw-deduplicate="TemplateStyles:r33663753">.mw-parser-output .side-box{margin:4px 0;box-sizing:border-box;border:1px solid #aaa;font-size:88%;line-height:1.25em;background-color:#f9f9f9;display:flow-root}.mw-parser-output .side-box-abovebelow,.mw-parser-output .side-box-text{padding:0.25em 0.9em}.mw-parser-output .side-box-image{padding:2px 0 2px 0.9em;text-align:center}.mw-parser-output .side-box-imageright{padding:2px 0.9em 2px 0;text-align:center}@media(min-width:500px){.mw-parser-output .side-box-flex{display:flex;align-items:center}.mw-parser-output .side-box-text{flex:1;min-width:0}}@media(min-width:720px){.mw-parser-output .side-box{width:238px}.mw-parser-output .side-box-right{clear:right;float:right;margin-left:1em}.mw-parser-output .side-box-left{margin-right:1em}.mw-parser-output .side-box-center{clear:both;margin:auto}}</style><div class="side-box metadata side-box-right plainlinks"> <div class="side-box-flex"> <div class="side-box-image"><span typeof="mw:File"><span><img alt="" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/4a/Commons-logo.svg/30px-Commons-logo.svg.png" decoding="async" width="30" height="40" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/4a/Commons-logo.svg/45px-Commons-logo.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/4a/Commons-logo.svg/59px-Commons-logo.svg.png 2x" data-file-width="1024" data-file-height="1376" /></span></span></div> <div class="side-box-text plainlist">A <span class="plainlinks"><a class="external text" href="https://commons.wikimedia.org/wiki/P%C3%A0gina_principal?uselang=ca">Wikimedia Commons</a></span> hi ha contingut multimèdia relatiu a: <i><b><a href="https://commons.wikimedia.org/wiki/Category:Octagons" class="extiw" title="commons:Category:Octagons">Octàgon</a></b></i></div></div> </div> <p><span style="display: none;" class="interProject"><a href="https://ca.wiktionary.org/wiki/oct%C3%A0gon" class="extiw" title="wikt:octàgon">Viccionari</a></span> </p> <div role="navigation" class="navbox" aria-labelledby="Polígons" style="padding:3px"><table class="nowraplinks collapsible collapsed navbox-inner" style="border-spacing:0;background:transparent;color:inherit"><tbody><tr><th scope="col" class="navbox-title" colspan="2"><div class="plainlinks hlist navbar mini"><ul><li class="nv-view"><span typeof="mw:File"><a href="/wiki/Plantilla:Pol%C3%ADgons" title="Plantilla:Polígons"><img alt="Vegeu aquesta plantilla" src="//upload.wikimedia.org/wikipedia/commons/thumb/2/28/Commons-emblem-notice.svg/18px-Commons-emblem-notice.svg.png" decoding="async" width="18" height="18" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/2/28/Commons-emblem-notice.svg/27px-Commons-emblem-notice.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/2/28/Commons-emblem-notice.svg/36px-Commons-emblem-notice.svg.png 2x" data-file-width="48" data-file-height="48" /></a></span></li></ul></div><div id="Polígons" style="font-size:114%;margin:0 4em"><a href="/wiki/Pol%C3%ADgon" title="Polígon">Polígons</a></div></th></tr><tr><td class="navbox-abovebelow" colspan="2"><div id="RegularLlista"><style data-mw-deduplicate="TemplateStyles:r31792667">.mw-parser-output .hlist dl,.mw-parser-output .hlist ol,.mw-parser-output .hlist ul{margin:0;padding:0}.mw-parser-output .hlist dd,.mw-parser-output .hlist dt,.mw-parser-output .hlist li{margin:0;display:inline}.mw-parser-output .hlist.inline,.mw-parser-output .hlist.inline dl,.mw-parser-output .hlist.inline ol,.mw-parser-output .hlist.inline ul,.mw-parser-output .hlist dl dl,.mw-parser-output .hlist dl ol,.mw-parser-output .hlist dl ul,.mw-parser-output .hlist ol dl,.mw-parser-output .hlist ol ol,.mw-parser-output .hlist ol ul,.mw-parser-output .hlist ul dl,.mw-parser-output .hlist ul ol,.mw-parser-output .hlist ul ul{display:inline}.mw-parser-output .hlist .mw-empty-li{display:none}.mw-parser-output .hlist dt::after{content:": "}.mw-parser-output .hlist dd::after,.mw-parser-output .hlist li::after{content:" · ";font-weight:bold}.mw-parser-output .hlist dd:last-child::after,.mw-parser-output .hlist dt:last-child::after,.mw-parser-output .hlist li:last-child::after{content:none}.mw-parser-output .hlist dd dd:first-child::before,.mw-parser-output .hlist dd dt:first-child::before,.mw-parser-output .hlist dd li:first-child::before,.mw-parser-output .hlist dt dd:first-child::before,.mw-parser-output .hlist dt dt:first-child::before,.mw-parser-output .hlist dt li:first-child::before,.mw-parser-output .hlist li dd:first-child::before,.mw-parser-output .hlist li dt:first-child::before,.mw-parser-output .hlist li li:first-child::before{content:" (";font-weight:normal}.mw-parser-output .hlist dd dd:last-child::after,.mw-parser-output .hlist dd dt:last-child::after,.mw-parser-output .hlist dd li:last-child::after,.mw-parser-output .hlist dt dd:last-child::after,.mw-parser-output .hlist dt dt:last-child::after,.mw-parser-output .hlist dt li:last-child::after,.mw-parser-output .hlist li dd:last-child::after,.mw-parser-output .hlist li dt:last-child::after,.mw-parser-output .hlist li li:last-child::after{content:")";font-weight:normal}.mw-parser-output .hlist ol{counter-reset:listitem}.mw-parser-output .hlist ol>li{counter-increment:listitem}.mw-parser-output .hlist ol>li::before{content:" "counter(listitem)"\a0 "}.mw-parser-output .hlist dd ol>li:first-child::before,.mw-parser-output .hlist dt ol>li:first-child::before,.mw-parser-output .hlist li ol>li:first-child::before{content:" ("counter(listitem)"\a0 "}</style><div class="hlist"><ul><li><a href="/wiki/Pol%C3%ADgon_regular" class="mw-redirect" title="Polígon regular">Regular</a></li><li><a href="/w/index.php?title=Llista_de_pol%C3%ADgons&action=edit&redlink=1" class="new" title="Llista de polígons (encara no existeix)">Llista</a></li></ul></div></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">1–10 costats</th><td class="navbox-list navbox-odd hlist" style="text-align:left;border-left-width:2px;border-left-style:solid;width:100%;padding:0px"><div style="padding:0em 0.25em"> <ul><li><a href="/w/index.php?title=Mon%C3%B2gon&action=edit&redlink=1" class="new" title="Monògon (encara no existeix)">Monògon</a></li> <li><a href="/w/index.php?title=D%C3%ADgon&action=edit&redlink=1" class="new" title="Dígon (encara no existeix)">Dígon</a></li> <li><a href="/wiki/Triangle" title="Triangle">Triangle</a> <ul><li><a href="/wiki/Triangle_equil%C3%A0ter" title="Triangle equilàter">Equilàter</a></li> <li><a href="/wiki/Triangle_is%C3%B2sceles" title="Triangle isòsceles">Isòsceles</a></li></ul></li> <li><a href="/wiki/Quadril%C3%A0ter" title="Quadrilàter">Quadrilàter</a> <ul><li><a href="/wiki/Quadrat_(geometria)" class="mw-redirect" title="Quadrat (geometria)">Quadrat</a></li> <li><a href="/wiki/Rectangle" title="Rectangle">Rectangle</a></li> <li><a href="/wiki/Rombe" title="Rombe">Rombe</a></li> <li><a href="/wiki/Paral%C2%B7lelogram" title="Paral·lelogram">Paral·lelogram</a></li> <li><a href="/wiki/Trapezi" title="Trapezi">Trapezi</a></li> <li><a href="/wiki/Deltoide" title="Deltoide">Deltoide</a></li></ul></li> <li><a href="/wiki/Pent%C3%A0gon_(geometria)" title="Pentàgon (geometria)">Pentàgon</a></li> <li><a href="/wiki/Hex%C3%A0gon" title="Hexàgon">Hexàgon</a></li> <li><a href="/wiki/Hept%C3%A0gon" title="Heptàgon">Heptàgon</a></li> <li><a class="mw-selflink selflink">Octàgon</a></li> <li><a href="/wiki/Enne%C3%A0gon" title="Enneàgon">Enneàgon</a></li> <li><a href="/wiki/Dec%C3%A0gon" title="Decàgon">Decàgon</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">11–20 costats</th><td class="navbox-list navbox-even hlist" style="text-align:left;border-left-width:2px;border-left-style:solid;width:100%;padding:0px"><div style="padding:0em 0.25em"> <ul><li><a href="/wiki/Hendec%C3%A0gon" title="Hendecàgon">Hendecàgon</a></li> <li><a href="/wiki/Dodec%C3%A0gon" title="Dodecàgon">Dodecàgon</a></li> <li><a href="/wiki/Tridec%C3%A0gon" title="Tridecàgon">Tridecàgon</a></li> <li><a href="/w/index.php?title=Tetradec%C3%A0gon&action=edit&redlink=1" class="new" title="Tetradecàgon (encara no existeix)">Tetradecàgon</a></li> <li><a href="/wiki/Pentadec%C3%A0gon" title="Pentadecàgon">Pentadecàgon</a></li> <li><a href="/wiki/Hexadec%C3%A0gon" title="Hexadecàgon">Hexadecàgon</a></li> <li><a href="/wiki/Heptadec%C3%A0gon" title="Heptadecàgon">Heptadecàgon</a></li> <li><a href="/wiki/Octodec%C3%A0gon" title="Octodecàgon">Octodecàgon</a></li> <li><a href="/w/index.php?title=Enneadec%C3%A0gon&action=edit&redlink=1" class="new" title="Enneadecàgon (encara no existeix)">Enneadecàgon</a></li> <li><a href="/wiki/Icos%C3%A0gon" title="Icosàgon">Icosàgon</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">21–100 costats<br />(seleccionats)</th><td class="navbox-list navbox-odd hlist" style="text-align:left;border-left-width:2px;border-left-style:solid;width:100%;padding:0px"><div style="padding:0em 0.25em"> <ul><li><a href="/w/index.php?title=Icos%C3%ADdigon&action=edit&redlink=1" class="new" title="Icosídigon (encara no existeix)">Icosídigon (22)</a></li> <li><a href="/w/index.php?title=Icositetr%C3%A0gon&action=edit&redlink=1" class="new" title="Icositetràgon (encara no existeix)">Icositetràgon (24)</a></li> <li><a href="/w/index.php?title=Icosihex%C3%A0gon&action=edit&redlink=1" class="new" title="Icosihexàgon (encara no existeix)">Icosihexàgon (26)</a></li> <li><a href="/w/index.php?title=Icosioct%C3%A0gon&action=edit&redlink=1" class="new" title="Icosioctàgon (encara no existeix)">Icosioctàgon (28)</a></li> <li><a href="/w/index.php?title=Triacont%C3%A0gon&action=edit&redlink=1" class="new" title="Triacontàgon (encara no existeix)">Triacontàgon (30)</a></li> <li><a href="/w/index.php?title=Triacontad%C3%ADgon&action=edit&redlink=1" class="new" title="Triacontadígon (encara no existeix)">Triacontadígon (32)</a></li> <li><a href="/w/index.php?title=Triacontatetr%C3%A0gon&action=edit&redlink=1" class="new" title="Triacontatetràgon (encara no existeix)">Triacontatetràgon (34)</a></li> <li><a href="/w/index.php?title=Tetracont%C3%A0gon&action=edit&redlink=1" class="new" title="Tetracontàgon (encara no existeix)">Tetracontàgon (40)</a></li> <li><a href="/w/index.php?title=Tetracontad%C3%ADgon&action=edit&redlink=1" class="new" title="Tetracontadígon (encara no existeix)">Tetracontadígon (42)</a></li> <li><a href="/w/index.php?title=Tetracontaoct%C3%A0gon&action=edit&redlink=1" class="new" title="Tetracontaoctàgon (encara no existeix)">Tetracontaoctàgon (48)</a></li> <li><a href="/w/index.php?title=Pentacont%C3%A0gon&action=edit&redlink=1" class="new" title="Pentacontàgon (encara no existeix)">Pentacontàgon (50)</a></li> <li><a href="/w/index.php?title=Hexacont%C3%A0gon&action=edit&redlink=1" class="new" title="Hexacontàgon (encara no existeix)">Hexacontàgon (60)</a></li> <li><a href="/w/index.php?title=Hexacontatetr%C3%A0gon&action=edit&redlink=1" class="new" title="Hexacontatetràgon (encara no existeix)">Hexacontatetràgon (64)</a></li> <li><a href="/w/index.php?title=Heptacont%C3%A0gon&action=edit&redlink=1" class="new" title="Heptacontàgon (encara no existeix)">Heptacontàgon (70)</a></li> <li><a href="/w/index.php?title=Octacont%C3%A0gon&action=edit&redlink=1" class="new" title="Octacontàgon (encara no existeix)">Octacontàgon (80)</a></li> <li><a href="/w/index.php?title=Enneacont%C3%A0gon&action=edit&redlink=1" class="new" title="Enneacontàgon (encara no existeix)">Enneacontàgon (90)</a></li> <li><a href="/w/index.php?title=Enneacontahex%C3%A0gon&action=edit&redlink=1" class="new" title="Enneacontahexàgon (encara no existeix)">Enneacontahexàgon (96)</a></li> <li><a href="/w/index.php?title=Hect%C3%B2gon&action=edit&redlink=1" class="new" title="Hectògon (encara no existeix)">Hectògon (100)</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">>100 costats</th><td class="navbox-list navbox-even hlist" style="text-align:left;border-left-width:2px;border-left-style:solid;width:100%;padding:0px"><div style="padding:0em 0.25em"> <ul><li><a href="/w/index.php?title=120-gon&action=edit&redlink=1" class="new" title="120-gon (encara no existeix)">120-gon</a></li> <li><a href="/w/index.php?title=257-gon&action=edit&redlink=1" class="new" title="257-gon (encara no existeix)">257-gon</a></li> <li><a href="/w/index.php?title=360-gon&action=edit&redlink=1" class="new" title="360-gon (encara no existeix)">360-gon</a></li> <li><a href="/w/index.php?title=Xili%C3%A0gon&action=edit&redlink=1" class="new" title="Xiliàgon (encara no existeix)">Xiliàgon (1,000)</a></li> <li><a href="/w/index.php?title=Miri%C3%A0gon&action=edit&redlink=1" class="new" title="Miriàgon (encara no existeix)">Miriàgon (10,000)</a></li> <li><a href="/w/index.php?title=65537-gon&action=edit&redlink=1" class="new" title="65537-gon (encara no existeix)">65537-gon</a></li> <li><a href="/w/index.php?title=Meg%C3%A0gon&action=edit&redlink=1" class="new" title="Megàgon (encara no existeix)">Megàgon (1,000,000)</a></li> <li><a href="/w/index.php?title=Apeir%C3%B2gon&action=edit&redlink=1" class="new" title="Apeirògon (encara no existeix)">Apeirògon (∞)</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Pol%C3%ADgon_estelat" title="Polígon estelat">Polígons estelats</a><br />(5–12 costats)</th><td class="navbox-list navbox-odd hlist" style="text-align:left;border-left-width:2px;border-left-style:solid;width:100%;padding:0px"><div style="padding:0em 0.25em"> <ul><li><a href="/wiki/Pentacle" title="Pentacle">Pentagrama</a></li> <li><a href="/wiki/Hexagrama" title="Hexagrama">Hexagrama</a></li> <li><a href="/w/index.php?title=Heptagrama&action=edit&redlink=1" class="new" title="Heptagrama (encara no existeix)">Heptagrama</a></li> <li><a href="/wiki/Octagrama" title="Octagrama">Octagrama</a></li> <li><a href="/wiki/Enneagrama_(geometria)" title="Enneagrama (geometria)">Enneagrama</a></li> <li><a href="/w/index.php?title=Decagrama&action=edit&redlink=1" class="new" title="Decagrama (encara no existeix)">Decagrama</a></li> <li><a href="/w/index.php?title=Hendecagrama&action=edit&redlink=1" class="new" title="Hendecagrama (encara no existeix)">Hendecagrama</a></li> <li><a href="/w/index.php?title=Dodecagrama&action=edit&redlink=1" class="new" title="Dodecagrama (encara no existeix)">Dodecagrama</a></li></ul> </div></td></tr></tbody></table></div> <div role="navigation" class="navbox" aria-label="Navbox" style="padding:3px"><table class="nowraplinks hlist navbox-inner" style="border-spacing:0;background:transparent;color:inherit"><tbody><tr><th scope="row" class="navbox-group" style="width:1%">Bases d'informació</th><td class="navbox-list navbox-odd" style="text-align:left;border-left-width:2px;border-left-style:solid;width:100%;padding:0px"><div style="padding:0em 0.25em"> <ul><li><a href="/wiki/GEC" class="mw-redirect" title="GEC">GEC</a> <span class="uid"> (<a rel="nofollow" class="external text" href="https://www.enciclopedia.cat/gran-enciclopedia-catalana/octogonal">1</a>)</span></li></ul> </div></td></tr></tbody></table></div>    </div><noscript><img src="https://login.wikimedia.org/wiki/Special:CentralAutoLogin/start?type=1x1" alt="" width="1" height="1" style="border: none; position: absolute;"></noscript> <div class="printfooter" data-nosnippet="">Obtingut de «<a dir="ltr" href="https://ca.wikipedia.org/w/index.php?title=Octàgon&oldid=33583697">https://ca.wikipedia.org/w/index.php?title=Octàgon&oldid=33583697</a>»</div></div> <div id="catlinks" class="catlinks" data-mw="interface"><div id="mw-normal-catlinks" class="mw-normal-catlinks"><a href="/wiki/Especial:Categorias" title="Especial:Categorias">Categoria</a>: <ul><li><a href="/wiki/Categoria:Pol%C3%ADgons" title="Categoria:Polígons">Polígons</a></li></ul></div><div id="mw-hidden-catlinks" 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