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[o]" accesskey="o"><span class="vector-icon mw-ui-icon-logIn mw-ui-icon-wikimedia-logIn"></span> <span>Skrá inn</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"> Síður fyrir útskráða notendur <a href="/wiki/Hj%C3%A1lp:Introduction" aria-label="Læra meira um breytingar"><span>Læra meira</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/Kerfiss%C3%AD%C3%B0a:Framl%C3%B6g_m%C3%ADn" title="Listi yfir breytingar frá þessu IP-staðfangi [y]" accesskey="y"><span>Framlög</span></a></li><li id="pt-anontalk" class="mw-list-item"><a href="/wiki/Kerfiss%C3%AD%C3%B0a:Spjallas%C3%AD%C3%B0a_m%C3%ADn" title="Spjall um breytingar frá þessu IP-staðfangi [n]" accesskey="n"><span>Spjall</span></a></li> </ul> </div> </div> </div> </div> </nav> </div> </header> </div> <div 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class="vector-pinnable-header-toggle-button vector-pinnable-header-pin-button" data-event-name="pinnable-header.vector-toc.pin">færa í hliðarstiku</button> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-unpin-button" data-event-name="pinnable-header.vector-toc.unpin">fela</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">Byrjun</div> </a> </li> <li id="toc-Formúlur" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Formúlur"> <div class="vector-toc-text"> <span class="vector-toc-numb">1</span> <span>Formúlur</span> </div> </a> <button aria-controls="toc-Formúlur-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>Sýna/fela Formúlur undirkafla</span> </button> <ul id="toc-Formúlur-sublist" class="vector-toc-list"> <li id="toc-Hringur" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Hringur"> <div class="vector-toc-text"> <span class="vector-toc-numb">1.1</span> <span>Hringur</span> </div> </a> <ul id="toc-Hringur-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Kúla" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Kúla"> <div class="vector-toc-text"> <span class="vector-toc-numb">1.2</span> <span>Kúla</span> </div> </a> <ul id="toc-Kúla-sublist" class="vector-toc-list"> </ul> </li> </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="Efni" 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="Sýna/fela efnisyfirlit" > <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">Sýna/fela efnisyfirlit</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">Geisli (rúmfræði)</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="Fara á grein á öðru tungumáli. Til staðar á 102 tungumálum" > <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-102" 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">102 tungumál</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/Radius" title="Radius – afríkanska" lang="af" hreflang="af" data-title="Radius" data-language-autonym="Afrikaans" data-language-local-name="afríkanska" class="interlanguage-link-target"><span>Afrikaans</span></a></li><li class="interlanguage-link interwiki-als mw-list-item"><a href="https://als.wikipedia.org/wiki/Radius_(Kreis)" title="Radius (Kreis) – svissnesk þýska" lang="gsw" hreflang="gsw" data-title="Radius (Kreis)" data-language-autonym="Alemannisch" data-language-local-name="svissnesk þýska" class="interlanguage-link-target"><span>Alemannisch</span></a></li><li class="interlanguage-link interwiki-am mw-list-item"><a href="https://am.wikipedia.org/wiki/%E1%88%AC%E1%8B%B5%E1%8B%A8%E1%88%B5" title="ሬድየስ – amharíska" lang="am" hreflang="am" data-title="ሬድየስ" data-language-autonym="አማርኛ" data-language-local-name="amharíska" class="interlanguage-link-target"><span>አማርኛ</span></a></li><li class="interlanguage-link interwiki-an mw-list-item"><a href="https://an.wikipedia.org/wiki/Radio_(cheometr%C3%ADa)" title="Radio (cheometría) – aragonska" lang="an" hreflang="an" data-title="Radio (cheometría)" data-language-autonym="Aragonés" data-language-local-name="aragonska" class="interlanguage-link-target"><span>Aragonés</span></a></li><li class="interlanguage-link interwiki-ar mw-list-item"><a href="https://ar.wikipedia.org/wiki/%D9%86%D8%B5%D9%81_%D8%A7%D9%84%D9%82%D8%B7%D8%B1" title="نصف القطر – arabíska" lang="ar" hreflang="ar" data-title="نصف القطر" data-language-autonym="العربية" data-language-local-name="arabíska" class="interlanguage-link-target"><span>العربية</span></a></li><li class="interlanguage-link interwiki-ast mw-list-item"><a href="https://ast.wikipedia.org/wiki/Radiu_(xeometr%C3%ADa)" title="Radiu (xeometría) – astúríska" lang="ast" hreflang="ast" data-title="Radiu (xeometría)" data-language-autonym="Asturianu" data-language-local-name="astúríska" class="interlanguage-link-target"><span>Asturianu</span></a></li><li class="interlanguage-link interwiki-az mw-list-item"><a href="https://az.wikipedia.org/wiki/Radius" title="Radius – aserska" lang="az" hreflang="az" data-title="Radius" data-language-autonym="Azərbaycanca" data-language-local-name="aserska" class="interlanguage-link-target"><span>Azərbaycanca</span></a></li><li class="interlanguage-link interwiki-ba mw-list-item"><a href="https://ba.wikipedia.org/wiki/%D0%A0%D0%B0%D0%B4%D0%B8%D1%83%D1%81" title="Радиус – baskír" lang="ba" hreflang="ba" data-title="Радиус" data-language-autonym="Башҡортса" data-language-local-name="baskír" class="interlanguage-link-target"><span>Башҡортса</span></a></li><li class="interlanguage-link interwiki-be mw-list-item"><a href="https://be.wikipedia.org/wiki/%D0%A0%D0%B0%D0%B4%D1%8B%D1%83%D1%81" title="Радыус – hvítrússneska" lang="be" hreflang="be" data-title="Радыус" data-language-autonym="Беларуская" data-language-local-name="hvítrússneska" class="interlanguage-link-target"><span>Беларуская</span></a></li><li class="interlanguage-link interwiki-be-x-old mw-list-item"><a href="https://be-tarask.wikipedia.org/wiki/%D0%A0%D0%B0%D0%B4%D1%8B%D1%8E%D1%81" title="Радыюс – Belarusian (Taraškievica orthography)" lang="be-tarask" hreflang="be-tarask" data-title="Радыюс" data-language-autonym="Беларуская (тарашкевіца)" data-language-local-name="Belarusian (Taraškievica orthography)" class="interlanguage-link-target"><span>Беларуская (тарашкевіца)</span></a></li><li class="interlanguage-link interwiki-bg mw-list-item"><a href="https://bg.wikipedia.org/wiki/%D0%A0%D0%B0%D0%B4%D0%B8%D1%83%D1%81" title="Радиус – búlgarska" lang="bg" hreflang="bg" data-title="Радиус" data-language-autonym="Български" data-language-local-name="búlgarska" class="interlanguage-link-target"><span>Български</span></a></li><li class="interlanguage-link interwiki-bn mw-list-item"><a href="https://bn.wikipedia.org/wiki/%E0%A6%AC%E0%A7%8D%E0%A6%AF%E0%A6%BE%E0%A6%B8%E0%A6%BE%E0%A6%B0%E0%A7%8D%E0%A6%A7" title="ব্যাসার্ধ – bengalska" lang="bn" hreflang="bn" data-title="ব্যাসার্ধ" data-language-autonym="বাংলা" data-language-local-name="bengalska" class="interlanguage-link-target"><span>বাংলা</span></a></li><li class="interlanguage-link interwiki-br mw-list-item"><a href="https://br.wikipedia.org/wiki/Skin_(geometriezh)" title="Skin (geometriezh) – bretónska" lang="br" hreflang="br" data-title="Skin (geometriezh)" data-language-autonym="Brezhoneg" data-language-local-name="bretónska" class="interlanguage-link-target"><span>Brezhoneg</span></a></li><li class="interlanguage-link interwiki-bs mw-list-item"><a href="https://bs.wikipedia.org/wiki/Polupre%C4%8Dnik" title="Poluprečnik – bosníska" lang="bs" hreflang="bs" data-title="Poluprečnik" data-language-autonym="Bosanski" data-language-local-name="bosníska" class="interlanguage-link-target"><span>Bosanski</span></a></li><li class="interlanguage-link interwiki-ca mw-list-item"><a href="https://ca.wikipedia.org/wiki/Radi_(geometria)" title="Radi (geometria) – katalónska" lang="ca" hreflang="ca" data-title="Radi (geometria)" data-language-autonym="Català" data-language-local-name="katalónska" class="interlanguage-link-target"><span>Català</span></a></li><li class="interlanguage-link interwiki-ckb mw-list-item"><a href="https://ckb.wikipedia.org/wiki/%D9%86%DB%8C%D9%88%DB%95%D8%AA%DB%8C%D8%B1%DB%95" title="نیوەتیرە – miðkúrdíska" lang="ckb" hreflang="ckb" data-title="نیوەتیرە" data-language-autonym="کوردی" data-language-local-name="miðkúrdíska" 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/Polom%C4%9Br" title="Poloměr – tékkneska" lang="cs" hreflang="cs" data-title="Poloměr" data-language-autonym="Čeština" data-language-local-name="tékkneska" 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%A0%D0%B0%D0%B4%D0%B8%D1%83%D1%81" title="Радиус – sjúvas" lang="cv" hreflang="cv" data-title="Радиус" data-language-autonym="Чӑвашла" data-language-local-name="sjúvas" 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/Radiws" title="Radiws – velska" lang="cy" hreflang="cy" data-title="Radiws" data-language-autonym="Cymraeg" data-language-local-name="velska" 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/Radius" title="Radius – danska" lang="da" hreflang="da" data-title="Radius" data-language-autonym="Dansk" data-language-local-name="danska" 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/Radius" title="Radius – þýska" lang="de" hreflang="de" data-title="Radius" data-language-autonym="Deutsch" data-language-local-name="þýska" 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%91%CE%BA%CF%84%CE%AF%CE%BD%CE%B1_(%CE%B3%CE%B5%CF%89%CE%BC%CE%B5%CF%84%CF%81%CE%AF%CE%B1)" title="Ακτίνα (γεωμετρία) – gríska" lang="el" hreflang="el" data-title="Ακτίνα (γεωμετρία)" data-language-autonym="Ελληνικά" data-language-local-name="gríska" 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/R%C3%A2%C7%B5_(giumetr%C3%ACa)" title="Râǵ (giumetrìa) – Emiliano-Romagnolo" lang="egl" hreflang="egl" data-title="Râǵ (giumetrìa)" 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/Radius" title="Radius – enska" lang="en" hreflang="en" data-title="Radius" data-language-autonym="English" data-language-local-name="enska" 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/Radiuso" title="Radiuso – esperantó" lang="eo" hreflang="eo" data-title="Radiuso" data-language-autonym="Esperanto" data-language-local-name="esperantó" 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/Radio_(geometr%C3%ADa)" title="Radio (geometría) – spænska" lang="es" hreflang="es" data-title="Radio (geometría)" data-language-autonym="Español" data-language-local-name="spænska" class="interlanguage-link-target"><span>Español</span></a></li><li class="interlanguage-link interwiki-et mw-list-item"><a href="https://et.wikipedia.org/wiki/Raadius" title="Raadius – eistneska" lang="et" hreflang="et" data-title="Raadius" data-language-autonym="Eesti" data-language-local-name="eistneska" class="interlanguage-link-target"><span>Eesti</span></a></li><li class="interlanguage-link interwiki-eu mw-list-item"><a href="https://eu.wikipedia.org/wiki/Erradio_(geometria)" title="Erradio (geometria) – baskneska" lang="eu" hreflang="eu" data-title="Erradio (geometria)" data-language-autonym="Euskara" data-language-local-name="baskneska" 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/%D8%B4%D8%B9%D8%A7%D8%B9" title="شعاع – persneska" lang="fa" hreflang="fa" data-title="شعاع" data-language-autonym="فارسی" data-language-local-name="persneska" 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/S%C3%A4de_(geometria)" title="Säde (geometria) – finnska" lang="fi" hreflang="fi" data-title="Säde (geometria)" data-language-autonym="Suomi" data-language-local-name="finnska" 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/Rayon_(g%C3%A9om%C3%A9trie)" title="Rayon (géométrie) – franska" lang="fr" hreflang="fr" data-title="Rayon (géométrie)" data-language-autonym="Français" data-language-local-name="franska" class="interlanguage-link-target"><span>Français</span></a></li><li class="interlanguage-link interwiki-frr badge-Q70894304 mw-list-item" title=""><a href="https://frr.wikipedia.org/wiki/Raadius" title="Raadius – norðurfrísneska" lang="frr" hreflang="frr" data-title="Raadius" data-language-autonym="Nordfriisk" data-language-local-name="norðurfrísneska" class="interlanguage-link-target"><span>Nordfriisk</span></a></li><li class="interlanguage-link interwiki-gd mw-list-item"><a href="https://gd.wikipedia.org/wiki/Reidius" title="Reidius – skosk gelíska" lang="gd" hreflang="gd" data-title="Reidius" data-language-autonym="Gàidhlig" data-language-local-name="skosk gelíska" class="interlanguage-link-target"><span>Gàidhlig</span></a></li><li class="interlanguage-link interwiki-gl mw-list-item"><a href="https://gl.wikipedia.org/wiki/Raio_(xeometr%C3%ADa)" title="Raio (xeometría) – galisíska" lang="gl" hreflang="gl" data-title="Raio (xeometría)" data-language-autonym="Galego" data-language-local-name="galisíska" class="interlanguage-link-target"><span>Galego</span></a></li><li class="interlanguage-link interwiki-gu mw-list-item"><a href="https://gu.wikipedia.org/wiki/%E0%AA%A4%E0%AB%8D%E0%AA%B0%E0%AA%BF%E0%AA%9C%E0%AB%8D%E0%AA%AF%E0%AA%BE" title="ત્રિજ્યા – gújaratí" lang="gu" hreflang="gu" data-title="ત્રિજ્યા" data-language-autonym="ગુજરાતી" data-language-local-name="gújaratí" class="interlanguage-link-target"><span>ગુજરાતી</span></a></li><li class="interlanguage-link interwiki-he mw-list-item"><a href="https://he.wikipedia.org/wiki/%D7%A8%D7%93%D7%99%D7%95%D7%A1" title="רדיוס – hebreska" lang="he" hreflang="he" data-title="רדיוס" data-language-autonym="עברית" data-language-local-name="hebreska" 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%A4%E0%A5%8D%E0%A4%B0%E0%A4%BF%E0%A4%9C%E0%A5%8D%E0%A4%AF%E0%A4%BE" title="त्रिज्या – hindí" lang="hi" hreflang="hi" data-title="त्रिज्या" data-language-autonym="हिन्दी" data-language-local-name="hindí" class="interlanguage-link-target"><span>हिन्दी</span></a></li><li class="interlanguage-link interwiki-hy mw-list-item"><a href="https://hy.wikipedia.org/wiki/%D5%87%D5%A1%D5%BC%D5%A1%D5%BE%D5%AB%D5%B2" title="Շառավիղ – armenska" lang="hy" hreflang="hy" data-title="Շառավիղ" data-language-autonym="Հայերեն" data-language-local-name="armenska" class="interlanguage-link-target"><span>Հայերեն</span></a></li><li class="interlanguage-link interwiki-ia mw-list-item"><a href="https://ia.wikipedia.org/wiki/Radio_(geometria)" title="Radio (geometria) – interlingua" lang="ia" hreflang="ia" data-title="Radio (geometria)" data-language-autonym="Interlingua" data-language-local-name="interlingua" class="interlanguage-link-target"><span>Interlingua</span></a></li><li class="interlanguage-link interwiki-id mw-list-item"><a href="https://id.wikipedia.org/wiki/Jari-jari" title="Jari-jari – indónesíska" lang="id" hreflang="id" data-title="Jari-jari" data-language-autonym="Bahasa Indonesia" data-language-local-name="indónesíska" class="interlanguage-link-target"><span>Bahasa Indonesia</span></a></li><li class="interlanguage-link interwiki-inh mw-list-item"><a href="https://inh.wikipedia.org/wiki/%D0%93%D3%80%D0%B0%D0%B9%D0%B8%D1%81%D1%82" title="ГӀайист – ingús" lang="inh" hreflang="inh" data-title="ГӀайист" data-language-autonym="ГӀалгӀай" data-language-local-name="ingús" class="interlanguage-link-target"><span>ГӀалгӀай</span></a></li><li class="interlanguage-link interwiki-it mw-list-item"><a href="https://it.wikipedia.org/wiki/Raggio_(geometria)" title="Raggio (geometria) – ítalska" lang="it" hreflang="it" data-title="Raggio (geometria)" data-language-autonym="Italiano" data-language-local-name="ítalska" 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%8D%8A%E5%BE%84" title="半径 – japanska" lang="ja" hreflang="ja" data-title="半径" data-language-autonym="日本語" data-language-local-name="japanska" 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%A0%E1%83%90%E1%83%93%E1%83%98%E1%83%A3%E1%83%A1%E1%83%98" title="რადიუსი – georgíska" lang="ka" hreflang="ka" data-title="რადიუსი" data-language-autonym="ქართული" data-language-local-name="georgíska" class="interlanguage-link-target"><span>ქართული</span></a></li><li class="interlanguage-link interwiki-kab mw-list-item"><a href="https://kab.wikipedia.org/wiki/Aqqa%E1%B9%9B" title="Aqqaṛ – kabíle" lang="kab" hreflang="kab" data-title="Aqqaṛ" data-language-autonym="Taqbaylit" data-language-local-name="kabíle" class="interlanguage-link-target"><span>Taqbaylit</span></a></li><li class="interlanguage-link interwiki-kk mw-list-item"><a href="https://kk.wikipedia.org/wiki/%D0%A0%D0%B0%D0%B4%D0%B8%D1%83%D1%81" title="Радиус – kasakska" lang="kk" hreflang="kk" data-title="Радиус" data-language-autonym="Қазақша" data-language-local-name="kasakska" class="interlanguage-link-target"><span>Қазақша</span></a></li><li class="interlanguage-link interwiki-km mw-list-item"><a href="https://km.wikipedia.org/wiki/%E1%9E%80%E1%9E%B6%E1%9F%86" title="កាំ – kmer" lang="km" hreflang="km" data-title="កាំ" data-language-autonym="ភាសាខ្មែរ" data-language-local-name="kmer" class="interlanguage-link-target"><span>ភាសាខ្មែរ</span></a></li><li class="interlanguage-link interwiki-ko mw-list-item"><a href="https://ko.wikipedia.org/wiki/%EB%B0%98%EC%A7%80%EB%A6%84" title="반지름 – kóreska" lang="ko" hreflang="ko" data-title="반지름" data-language-autonym="한국어" data-language-local-name="kóreska" class="interlanguage-link-target"><span>한국어</span></a></li><li class="interlanguage-link interwiki-ky mw-list-item"><a href="https://ky.wikipedia.org/wiki/%D0%A0%D0%B0%D0%B4%D0%B8%D1%83%D1%81_(%D0%B0%D0%B9%D0%BB%D0%B0%D0%BD%D0%B0%D0%BD%D1%8B%D0%BD)" title="Радиус (айлананын) – kirgiska" lang="ky" hreflang="ky" data-title="Радиус (айлананын)" data-language-autonym="Кыргызча" data-language-local-name="kirgiska" class="interlanguage-link-target"><span>Кыргызча</span></a></li><li class="interlanguage-link interwiki-lb mw-list-item"><a href="https://lb.wikipedia.org/wiki/Radius" title="Radius – lúxemborgíska" lang="lb" hreflang="lb" data-title="Radius" data-language-autonym="Lëtzebuergesch" data-language-local-name="lúxemborgíska" class="interlanguage-link-target"><span>Lëtzebuergesch</span></a></li><li class="interlanguage-link interwiki-lt mw-list-item"><a href="https://lt.wikipedia.org/wiki/Apskritimo_spindulys" title="Apskritimo spindulys – litháíska" lang="lt" hreflang="lt" data-title="Apskritimo spindulys" data-language-autonym="Lietuvių" data-language-local-name="litháíska" 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/R%C4%81diuss" title="Rādiuss – lettneska" lang="lv" hreflang="lv" data-title="Rādiuss" data-language-autonym="Latviešu" data-language-local-name="lettneska" class="interlanguage-link-target"><span>Latviešu</span></a></li><li class="interlanguage-link interwiki-mg mw-list-item"><a href="https://mg.wikipedia.org/wiki/Tana_(je%C3%B4metria)" title="Tana (jeômetria) – malagasíska" lang="mg" hreflang="mg" data-title="Tana (jeômetria)" data-language-autonym="Malagasy" data-language-local-name="malagasíska" class="interlanguage-link-target"><span>Malagasy</span></a></li><li class="interlanguage-link interwiki-mk mw-list-item"><a href="https://mk.wikipedia.org/wiki/%D0%9F%D0%BE%D0%BB%D1%83%D0%BF%D1%80%D0%B5%D1%87%D0%BD%D0%B8%D0%BA" title="Полупречник – makedónska" lang="mk" hreflang="mk" data-title="Полупречник" data-language-autonym="Македонски" data-language-local-name="makedónska" class="interlanguage-link-target"><span>Македонски</span></a></li><li class="interlanguage-link interwiki-ml mw-list-item"><a href="https://ml.wikipedia.org/wiki/%E0%B4%86%E0%B4%B0%E0%B4%82" title="ആരം – malajalam" lang="ml" hreflang="ml" data-title="ആരം" data-language-autonym="മലയാളം" data-language-local-name="malajalam" class="interlanguage-link-target"><span>മലയാളം</span></a></li><li class="interlanguage-link interwiki-mn mw-list-item"><a href="https://mn.wikipedia.org/wiki/%D0%A0%D0%B0%D0%B4%D0%B8%D1%83%D1%81" title="Радиус – mongólska" lang="mn" hreflang="mn" data-title="Радиус" data-language-autonym="Монгол" data-language-local-name="mongólska" class="interlanguage-link-target"><span>Монгол</span></a></li><li class="interlanguage-link interwiki-mr mw-list-item"><a href="https://mr.wikipedia.org/wiki/%E0%A4%A4%E0%A5%8D%E0%A4%B0%E0%A4%BF%E0%A4%9C%E0%A5%8D%E0%A4%AF%E0%A4%BE" title="त्रिज्या – maratí" lang="mr" hreflang="mr" data-title="त्रिज्या" data-language-autonym="मराठी" data-language-local-name="maratí" class="interlanguage-link-target"><span>मराठी</span></a></li><li class="interlanguage-link interwiki-ms mw-list-item"><a href="https://ms.wikipedia.org/wiki/Jejari" title="Jejari – malaíska" lang="ms" hreflang="ms" data-title="Jejari" data-language-autonym="Bahasa Melayu" data-language-local-name="malaíska" class="interlanguage-link-target"><span>Bahasa Melayu</span></a></li><li class="interlanguage-link interwiki-my mw-list-item"><a href="https://my.wikipedia.org/wiki/%E1%80%A1%E1%80%81%E1%80%BB%E1%80%84%E1%80%BA%E1%80%B8%E1%80%9D%E1%80%80%E1%80%BA" title="အချင်းဝက် – búrmneska" lang="my" hreflang="my" data-title="အချင်းဝက်" data-language-autonym="မြန်မာဘာသာ" data-language-local-name="búrmneska" class="interlanguage-link-target"><span>မြန်မာဘာသာ</span></a></li><li class="interlanguage-link interwiki-ne mw-list-item"><a href="https://ne.wikipedia.org/wiki/%E0%A4%85%E0%A4%B0%E0%A5%8D%E0%A4%A7%E0%A4%B5%E0%A5%8D%E0%A4%AF%E0%A4%BE%E0%A4%B8" title="अर्धव्यास – nepalska" lang="ne" hreflang="ne" data-title="अर्धव्यास" data-language-autonym="नेपाली" data-language-local-name="nepalska" class="interlanguage-link-target"><span>नेपाली</span></a></li><li class="interlanguage-link interwiki-nl mw-list-item"><a href="https://nl.wikipedia.org/wiki/Straal_(wiskunde)" title="Straal (wiskunde) – hollenska" lang="nl" hreflang="nl" data-title="Straal (wiskunde)" data-language-autonym="Nederlands" data-language-local-name="hollenska" 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/Radius" title="Radius – nýnorska" lang="nn" hreflang="nn" data-title="Radius" data-language-autonym="Norsk nynorsk" data-language-local-name="nýnorska" 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/Radius" title="Radius – norskt bókmál" lang="nb" hreflang="nb" data-title="Radius" data-language-autonym="Norsk bokmål" data-language-local-name="norskt bókmál" class="interlanguage-link-target"><span>Norsk bokmål</span></a></li><li class="interlanguage-link interwiki-oc mw-list-item"><a href="https://oc.wikipedia.org/wiki/Rai_(geometria)" title="Rai (geometria) – oksítaníska" lang="oc" hreflang="oc" data-title="Rai (geometria)" data-language-autonym="Occitan" data-language-local-name="oksítaníska" class="interlanguage-link-target"><span>Occitan</span></a></li><li class="interlanguage-link interwiki-om mw-list-item"><a href="https://om.wikipedia.org/wiki/Raadiyesii" title="Raadiyesii – oromo" lang="om" hreflang="om" data-title="Raadiyesii" data-language-autonym="Oromoo" data-language-local-name="oromo" class="interlanguage-link-target"><span>Oromoo</span></a></li><li class="interlanguage-link interwiki-pa mw-list-item"><a href="https://pa.wikipedia.org/wiki/%E0%A8%B0%E0%A9%87%E0%A8%A1%E0%A9%80%E0%A8%85%E0%A8%B8" title="ਰੇਡੀਅਸ – púnjabí" lang="pa" hreflang="pa" data-title="ਰੇਡੀਅਸ" data-language-autonym="ਪੰਜਾਬੀ" data-language-local-name="púnjabí" class="interlanguage-link-target"><span>ਪੰਜਾਬੀ</span></a></li><li class="interlanguage-link interwiki-pl mw-list-item"><a href="https://pl.wikipedia.org/wiki/Promie%C5%84_(geometria)" title="Promień (geometria) – pólska" lang="pl" hreflang="pl" data-title="Promień (geometria)" data-language-autonym="Polski" data-language-local-name="pólska" class="interlanguage-link-target"><span>Polski</span></a></li><li class="interlanguage-link interwiki-pnb mw-list-item"><a href="https://pnb.wikipedia.org/wiki/%D8%B1%D8%AF%D8%A7%D8%B3" title="رداس – Western Punjabi" lang="pnb" hreflang="pnb" data-title="رداس" data-language-autonym="پنجابی" data-language-local-name="Western Punjabi" class="interlanguage-link-target"><span>پنجابی</span></a></li><li class="interlanguage-link interwiki-pt mw-list-item"><a href="https://pt.wikipedia.org/wiki/Raio_(geometria)" title="Raio (geometria) – portúgalska" lang="pt" hreflang="pt" data-title="Raio (geometria)" data-language-autonym="Português" data-language-local-name="portúgalska" class="interlanguage-link-target"><span>Português</span></a></li><li class="interlanguage-link interwiki-qu mw-list-item"><a href="https://qu.wikipedia.org/wiki/Illwa" title="Illwa – kvesjúa" lang="qu" hreflang="qu" data-title="Illwa" data-language-autonym="Runa Simi" data-language-local-name="kvesjúa" class="interlanguage-link-target"><span>Runa Simi</span></a></li><li class="interlanguage-link interwiki-ro mw-list-item"><a href="https://ro.wikipedia.org/wiki/Raz%C4%83" title="Rază – rúmenska" lang="ro" hreflang="ro" data-title="Rază" data-language-autonym="Română" data-language-local-name="rúmenska" 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%A0%D0%B0%D0%B4%D0%B8%D1%83%D1%81" title="Радиус – rússneska" lang="ru" hreflang="ru" data-title="Радиус" data-language-autonym="Русский" data-language-local-name="rússneska" class="interlanguage-link-target"><span>Русский</span></a></li><li class="interlanguage-link interwiki-sc mw-list-item"><a href="https://sc.wikipedia.org/wiki/Raju_(geometria)" title="Raju (geometria) – sardínska" lang="sc" hreflang="sc" data-title="Raju (geometria)" data-language-autonym="Sardu" data-language-local-name="sardínska" class="interlanguage-link-target"><span>Sardu</span></a></li><li class="interlanguage-link interwiki-sco mw-list-item"><a href="https://sco.wikipedia.org/wiki/Radius" title="Radius – skoska" lang="sco" hreflang="sco" data-title="Radius" data-language-autonym="Scots" data-language-local-name="skoska" class="interlanguage-link-target"><span>Scots</span></a></li><li class="interlanguage-link interwiki-sh mw-list-item"><a href="https://sh.wikipedia.org/wiki/Radijus" title="Radijus – serbókróatíska" lang="sh" hreflang="sh" data-title="Radijus" data-language-autonym="Srpskohrvatski / српскохрватски" data-language-local-name="serbókróatíska" class="interlanguage-link-target"><span>Srpskohrvatski / српскохрватски</span></a></li><li class="interlanguage-link interwiki-si mw-list-item"><a href="https://si.wikipedia.org/wiki/%E0%B6%85%E0%B6%BB%E0%B6%BA" title="අරය – singalíska" lang="si" hreflang="si" data-title="අරය" data-language-autonym="සිංහල" data-language-local-name="singalíska" class="interlanguage-link-target"><span>සිංහල</span></a></li><li class="interlanguage-link interwiki-simple mw-list-item"><a href="https://simple.wikipedia.org/wiki/Radius" title="Radius – Simple English" lang="en-simple" hreflang="en-simple" data-title="Radius" 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/Polomer_(kru%C5%BEnica)" title="Polomer (kružnica) – slóvakíska" lang="sk" hreflang="sk" data-title="Polomer (kružnica)" data-language-autonym="Slovenčina" data-language-local-name="slóvakíska" 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/Polmer" title="Polmer – slóvenska" lang="sl" hreflang="sl" data-title="Polmer" data-language-autonym="Slovenščina" data-language-local-name="slóvenska" class="interlanguage-link-target"><span>Slovenščina</span></a></li><li class="interlanguage-link interwiki-sn mw-list-item"><a href="https://sn.wikipedia.org/wiki/Taramunyongo" title="Taramunyongo – shona" lang="sn" hreflang="sn" data-title="Taramunyongo" data-language-autonym="ChiShona" data-language-local-name="shona" class="interlanguage-link-target"><span>ChiShona</span></a></li><li class="interlanguage-link interwiki-so mw-list-item"><a href="https://so.wikipedia.org/wiki/Gacan_(Joomitiri)" title="Gacan (Joomitiri) – sómalska" lang="so" hreflang="so" data-title="Gacan (Joomitiri)" data-language-autonym="Soomaaliga" data-language-local-name="sómalska" class="interlanguage-link-target"><span>Soomaaliga</span></a></li><li class="interlanguage-link interwiki-sq mw-list-item"><a href="https://sq.wikipedia.org/wiki/Rrezja" title="Rrezja – albanska" lang="sq" hreflang="sq" data-title="Rrezja" data-language-autonym="Shqip" data-language-local-name="albanska" class="interlanguage-link-target"><span>Shqip</span></a></li><li class="interlanguage-link interwiki-sr mw-list-item"><a href="https://sr.wikipedia.org/wiki/%D0%9F%D0%BE%D0%BB%D1%83%D0%BF%D1%80%D0%B5%D1%87%D0%BD%D0%B8%D0%BA" title="Полупречник – serbneska" lang="sr" hreflang="sr" data-title="Полупречник" data-language-autonym="Српски / srpski" data-language-local-name="serbneska" 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/Radie" title="Radie – sænska" lang="sv" hreflang="sv" data-title="Radie" data-language-autonym="Svenska" data-language-local-name="sænska" class="interlanguage-link-target"><span>Svenska</span></a></li><li class="interlanguage-link interwiki-sw mw-list-item"><a href="https://sw.wikipedia.org/wiki/Nusukipenyo" title="Nusukipenyo – svahílí" lang="sw" hreflang="sw" data-title="Nusukipenyo" data-language-autonym="Kiswahili" data-language-local-name="svahílí" class="interlanguage-link-target"><span>Kiswahili</span></a></li><li class="interlanguage-link interwiki-szl mw-list-item"><a href="https://szl.wikipedia.org/wiki/Pr%C5%8Dmiy%C5%84_(geometryj%C5%8F)" title="Prōmiyń (geometryjŏ) – Silesian" lang="szl" hreflang="szl" data-title="Prōmiyń (geometryjŏ)" data-language-autonym="Ślůnski" data-language-local-name="Silesian" class="interlanguage-link-target"><span>Ślůnski</span></a></li><li class="interlanguage-link interwiki-ta mw-list-item"><a href="https://ta.wikipedia.org/wiki/%E0%AE%86%E0%AE%B0%E0%AE%AE%E0%AF%8D,_%E0%AE%B5%E0%AE%9F%E0%AE%BF%E0%AE%B5%E0%AE%BF%E0%AE%AF%E0%AE%B2%E0%AF%8D" title="ஆரம், வடிவியல் – tamílska" lang="ta" hreflang="ta" data-title="ஆரம், வடிவியல்" data-language-autonym="தமிழ்" data-language-local-name="tamílska" class="interlanguage-link-target"><span>தமிழ்</span></a></li><li class="interlanguage-link interwiki-te mw-list-item"><a href="https://te.wikipedia.org/wiki/%E0%B0%B5%E0%B1%8D%E0%B0%AF%E0%B0%BE%E0%B0%B8%E0%B0%BE%E0%B0%B0%E0%B1%8D%E0%B0%A5%E0%B0%AE%E0%B1%81" title="వ్యాసార్థము – telúgú" lang="te" hreflang="te" data-title="వ్యాసార్థము" data-language-autonym="తెలుగు" data-language-local-name="telúgú" class="interlanguage-link-target"><span>తెలుగు</span></a></li><li class="interlanguage-link interwiki-th mw-list-item"><a href="https://th.wikipedia.org/wiki/%E0%B8%A3%E0%B8%B1%E0%B8%A8%E0%B8%A1%E0%B8%B5" title="รัศมี – taílenska" lang="th" hreflang="th" data-title="รัศมี" data-language-autonym="ไทย" data-language-local-name="taílenska" 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/Radius" title="Radius – tagalog" lang="tl" hreflang="tl" data-title="Radius" data-language-autonym="Tagalog" data-language-local-name="tagalog" 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/Yar%C4%B1%C3%A7ap" title="Yarıçap – tyrkneska" lang="tr" hreflang="tr" data-title="Yarıçap" data-language-autonym="Türkçe" data-language-local-name="tyrkneska" class="interlanguage-link-target"><span>Türkçe</span></a></li><li class="interlanguage-link interwiki-tt mw-list-item"><a href="https://tt.wikipedia.org/wiki/%D0%A0%D0%B0%D0%B4%D0%B8%D1%83%D1%81" title="Радиус – tatarska" lang="tt" hreflang="tt" data-title="Радиус" data-language-autonym="Татарча / tatarça" data-language-local-name="tatarska" class="interlanguage-link-target"><span>Татарча / tatarça</span></a></li><li class="interlanguage-link interwiki-uk mw-list-item"><a href="https://uk.wikipedia.org/wiki/%D0%A0%D0%B0%D0%B4%D1%96%D1%83%D1%81" title="Радіус – úkraínska" lang="uk" hreflang="uk" data-title="Радіус" data-language-autonym="Українська" data-language-local-name="úkraínska" 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/%D8%B1%D8%AF%D8%A7%D8%B3" title="رداس – úrdú" lang="ur" hreflang="ur" data-title="رداس" data-language-autonym="اردو" data-language-local-name="úrdú" class="interlanguage-link-target"><span>اردو</span></a></li><li class="interlanguage-link interwiki-uz mw-list-item"><a href="https://uz.wikipedia.org/wiki/Radius" title="Radius – úsbekska" lang="uz" hreflang="uz" data-title="Radius" data-language-autonym="Oʻzbekcha / ўзбекча" data-language-local-name="úsbekska" class="interlanguage-link-target"><span>Oʻzbekcha / ўзбекча</span></a></li><li class="interlanguage-link interwiki-vi mw-list-item"><a href="https://vi.wikipedia.org/wiki/B%C3%A1n_k%C3%ADnh" title="Bán kính – víetnamska" lang="vi" hreflang="vi" data-title="Bán kính" data-language-autonym="Tiếng Việt" data-language-local-name="víetnamska" class="interlanguage-link-target"><span>Tiếng Việt</span></a></li><li class="interlanguage-link interwiki-wuu mw-list-item"><a href="https://wuu.wikipedia.org/wiki/%E5%8D%8A%E5%BE%84" title="半径 – wu-kínverska" lang="wuu" hreflang="wuu" data-title="半径" data-language-autonym="吴语" data-language-local-name="wu-kínverska" class="interlanguage-link-target"><span>吴语</span></a></li><li class="interlanguage-link interwiki-yi mw-list-item"><a href="https://yi.wikipedia.org/wiki/%D7%A8%D7%90%D7%93%D7%99%D7%95%D7%A1" title="ראדיוס – jiddíska" lang="yi" hreflang="yi" data-title="ראדיוס" data-language-autonym="ייִדיש" data-language-local-name="jiddíska" class="interlanguage-link-target"><span>ייִדיש</span></a></li><li class="interlanguage-link interwiki-yo mw-list-item"><a href="https://yo.wikipedia.org/wiki/%C3%8Cd%C3%A1m%C3%A9j%C3%AC_%C3%B2b%C3%ACr%C3%ACk%C3%ACti%C3%AC" title="Ìdáméjì òbìrìkìtiì – jórúba" lang="yo" hreflang="yo" data-title="Ìdáméjì òbìrìkìtiì" data-language-autonym="Yorùbá" data-language-local-name="jórúba" class="interlanguage-link-target"><span>Yorùbá</span></a></li><li class="interlanguage-link interwiki-zh mw-list-item"><a href="https://zh.wikipedia.org/wiki/%E5%8D%8A%E5%BE%84" title="半径 – kínverska" lang="zh" hreflang="zh" data-title="半径" data-language-autonym="中文" data-language-local-name="kínverska" class="interlanguage-link-target"><span>中文</span></a></li><li class="interlanguage-link interwiki-zh-min-nan mw-list-item"><a href="https://zh-min-nan.wikipedia.org/wiki/Po%C3%A0%E2%81%BF-k%C3%A8ng" title="Poàⁿ-kèng – Minnan" lang="nan" hreflang="nan" data-title="Poàⁿ-kèng" data-language-autonym="閩南語 / Bân-lâm-gú" data-language-local-name="Minnan" class="interlanguage-link-target"><span>閩南語 / Bân-lâm-gú</span></a></li><li class="interlanguage-link interwiki-zh-yue mw-list-item"><a href="https://zh-yue.wikipedia.org/wiki/%E5%8D%8A%E5%BE%91" title="半徑 – kantónska" lang="yue" hreflang="yue" data-title="半徑" data-language-autonym="粵語" data-language-local-name="kantónska" 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/Q173817#sitelinks-wikipedia" title="Breyta tungumálatenglum" class="wbc-editpage">Breyta tenglum</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="Nafnrými"> <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/Geisli_(r%C3%BAmfr%C3%A6%C3%B0i)" title="Sýna efnissíðuna [c]" accesskey="c"><span>Síða</span></a></li><li id="ca-talk" class="new vector-tab-noicon mw-list-item"><a href="/w/index.php?title=Spjall:Geisli_(r%C3%BAmfr%C3%A6%C3%B0i)&action=edit&redlink=1" rel="discussion" class="new" title="Spallsíða þessarar síðu (síða er ekki enn til) [t]" accesskey="t"><span>Spjall</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="Breyta tungumálaafbrigði" > <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">íslenska</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="Sýn"> <div id="p-views" class="vector-menu vector-menu-tabs mw-portlet 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vector-more-collapsible-item mw-list-item"><a href="/wiki/Geisli_(r%C3%BAmfr%C3%A6%C3%B0i)"><span>Lesa</span></a></li><li id="ca-more-ve-edit" class="vector-more-collapsible-item mw-list-item"><a href="/w/index.php?title=Geisli_(r%C3%BAmfr%C3%A6%C3%B0i)&veaction=edit" title="Breyta þessari síðu [v]" accesskey="v"><span>Breyta</span></a></li><li id="ca-more-edit" class="collapsible vector-more-collapsible-item mw-list-item"><a href="/w/index.php?title=Geisli_(r%C3%BAmfr%C3%A6%C3%B0i)&action=edit" title="Breyta frumkóða síðunnar [e]" accesskey="e"><span>Breyta frumkóða</span></a></li><li id="ca-more-history" class="vector-more-collapsible-item mw-list-item"><a href="/w/index.php?title=Geisli_(r%C3%BAmfr%C3%A6%C3%B0i)&action=history"><span>Breytingaskrá</span></a></li> </ul> </div> </div> <div id="p-tb" class="vector-menu mw-portlet mw-portlet-tb" > <div class="vector-menu-heading"> Almennt </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="t-whatlinkshere" class="mw-list-item"><a href="/wiki/Kerfiss%C3%AD%C3%B0a:S%C3%AD%C3%B0ur_sem_tengjast_hinga%C3%B0/Geisli_(r%C3%BAmfr%C3%A6%C3%B0i)" title="Listi yfir síður sem tengjast í þessa [j]" accesskey="j"><span>Hvað tengist hingað</span></a></li><li id="t-recentchangeslinked" class="mw-list-item"><a href="/wiki/Kerfiss%C3%AD%C3%B0a:N%C3%BDlegar_breytingar_tengdar/Geisli_(r%C3%BAmfr%C3%A6%C3%B0i)" rel="nofollow" title="Nýlegar breytingar á ítengdum síðum [k]" accesskey="k"><span>Skyldar breytingar</span></a></li><li id="t-upload" class="mw-list-item"><a href="/wiki/Wikipedia:Hlaða_inn_skrá" title="Hlaða inn skrám [u]" accesskey="u"><span>Hlaða inn skrá</span></a></li><li id="t-specialpages" class="mw-list-item"><a href="/wiki/Kerfiss%C3%AD%C3%B0a:Kerfiss%C3%AD%C3%B0ur" title="Listi yfir kerfissíður [q]" accesskey="q"><span>Kerfissíður</span></a></li><li id="t-permalink" class="mw-list-item"><a href="/w/index.php?title=Geisli_(r%C3%BAmfr%C3%A6%C3%B0i)&oldid=1784635" title="Varanlegur tengill í þessa útgáfu síðunnar"><span>Varanlegur tengill</span></a></li><li id="t-info" class="mw-list-item"><a href="/w/index.php?title=Geisli_(r%C3%BAmfr%C3%A6%C3%B0i)&action=info" title="Frekari upplýsingar um þessa síðu"><span>Síðuupplýsingar</span></a></li><li id="t-cite" class="mw-list-item"><a href="/w/index.php?title=Kerfiss%C3%AD%C3%B0a:CiteThisPage&page=Geisli_%28r%C3%BAmfr%C3%A6%C3%B0i%29&id=1784635&wpFormIdentifier=titleform" title="Upplýsingar um hvernig á að vitna í þessa síðu"><span>Vitna í þessa síðu</span></a></li><li id="t-urlshortener" class="mw-list-item"><a href="/w/index.php?title=Kerfiss%C3%AD%C3%B0a:UrlShortener&url=https%3A%2F%2Fis.wikipedia.org%2Fwiki%2FGeisli_%28r%25C3%25BAmfr%25C3%25A6%25C3%25B0i%29"><span>Fá styttan tengil</span></a></li><li id="t-urlshortener-qrcode" class="mw-list-item"><a href="/w/index.php?title=Kerfiss%C3%AD%C3%B0a:QrCode&url=https%3A%2F%2Fis.wikipedia.org%2Fwiki%2FGeisli_%28r%25C3%25BAmfr%25C3%25A6%25C3%25B0i%29"><span>Niðurhlaða QR-kóða</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"> Prenta/flytja út </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=Kerfiss%C3%AD%C3%B0a:Book&bookcmd=book_creator&referer=Geisli+%28r%C3%BAmfr%C3%A6%C3%B0i%29"><span>Búa til bók</span></a></li><li id="coll-download-as-rl" class="mw-list-item"><a href="/w/index.php?title=Kerfiss%C3%AD%C3%B0a:DownloadAsPdf&page=Geisli_%28r%C3%BAmfr%C3%A6%C3%B0i%29&action=show-download-screen"><span>Sækja sem PDF</span></a></li><li id="t-print" class="mw-list-item"><a href="/w/index.php?title=Geisli_(r%C3%BAmfr%C3%A6%C3%B0i)&printable=yes" title="Prentanleg útgáfa af þessari síðu [p]" accesskey="p"><span>Prentvæn útgáfa</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"> Í öðrum verkefnum </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/Radius" hreflang="en"><span>Wikimedia 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/Q173817" title="Tengill á tengdan hlut í gagnagrunni [g]" accesskey="g"><span>Wikidata hlutur</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="Síðuverkfæri"> <div id="vector-page-tools-pinned-container" class="vector-pinned-container"> </div> </nav> <nav class="vector-appearance-landmark" aria-label="Útlit"> <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">Útlit</div> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-pin-button" data-event-name="pinnable-header.vector-appearance.pin">færa í hliðarstiku</button> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-unpin-button" data-event-name="pinnable-header.vector-appearance.unpin">fela</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">Úr Wikipediu, frjálsa alfræðiritinu</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="is" dir="ltr"><figure typeof="mw:File/Frame"><a href="/wiki/Mynd:Kreis.png" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/3/38/Kreis.png" decoding="async" width="200" height="200" class="mw-file-element" data-file-width="200" data-file-height="200" /></a><figcaption>Hér er <b>M</b> miðpunktur <a href="/wiki/Hringur_(r%C3%BAmfr%C3%A6%C3%B0i)" title="Hringur (rúmfræði)">hringsins</a>, <span style="color:#d71101;">r</span> geisli hans og <span style="color:#3838c4;">d</span> <a href="/wiki/%C3%9Everm%C3%A1l" title="Þvermál">þvermálið</a>, og svarta línan <a href="/wiki/Umm%C3%A1l" title="Ummál">ummál</a> hans.</figcaption></figure> <p><b>Geisli</b> eða <b>radíus</b> (áður fyrr nefndur <b>spölur</b> eða <b>hringspeli</b>, sjá <a href="/wiki/Listi_yfir_samheiti_%C3%AD_st%C3%A6r%C3%B0fr%C3%A6%C3%B0i" title="Listi yfir samheiti í stærðfræði">samheiti innan stærðfræðinnar</a>) <a href="/wiki/Hringur_(r%C3%BAmfr%C3%A6%C3%B0i)" title="Hringur (rúmfræði)">hrings</a> eða <a href="/wiki/K%C3%BAla" title="Kúla">kúlu</a> er í <a href="/w/index.php?title=Evkl%C3%AD%C3%B0sk_r%C3%BAmfr%C3%A6%C3%B0i&action=edit&redlink=1" class="new" title="Evklíðsk rúmfræði (síða er ekki enn til)">evklíðskri rúmfræði</a> fjarlægðin frá <a href="/w/index.php?title=Mi%C3%B0punktur&action=edit&redlink=1" class="new" title="Miðpunktur (síða er ekki enn til)">miðpunktinum</a> að <a href="/w/index.php?title=Hringferill&action=edit&redlink=1" class="new" title="Hringferill (síða er ekki enn til)">hringferlinum</a> og er þar með helmingur <a href="/wiki/%C3%9Everm%C3%A1l" title="Þvermál">þvermálsins</a>. Venja er að nota <a href="/wiki/Breyta" title="Breyta">breytuna</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 r}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi>r</mi> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle r}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/0d1ecb613aa2984f0576f70f86650b7c2a132538" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.338ex; width:1.049ex; height:1.676ex;" alt="{\displaystyle r}"></span> þegar talað er um geisla, það gildir að: </p> <div class="mw-heading mw-heading2"><h2 id="Formúlur"><span id="Form.C3.BAlur"></span>Formúlur</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Geisli_(r%C3%BAmfr%C3%A6%C3%B0i)&veaction=edit&section=1" title="Breyti hluta: Formúlur" class="mw-editsection-visualeditor"><span>breyta</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Geisli_(r%C3%BAmfr%C3%A6%C3%B0i)&action=edit&section=1" title="Edit section's source code: Formúlur"><span>breyta frumkóða</span></a><span class="mw-editsection-bracket">]</span></span></div> <p><a href="/w/index.php?title=Form%C3%BAla&action=edit&redlink=1" class="new" title="Formúla (síða er ekki enn til)">Formúlur</a> forma tengdar geisla þeirra, hér er <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 r}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi>r</mi> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle r}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/0d1ecb613aa2984f0576f70f86650b7c2a132538" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.338ex; width:1.049ex; height:1.676ex;" alt="{\displaystyle r}"></span> = geisli, <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 U}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi>U</mi> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle U}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/458a728f53b9a0274f059cd695e067c430956025" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.338ex; width:1.783ex; height:2.176ex;" alt="{\displaystyle U}"></span> = <a href="/wiki/Umm%C3%A1l" title="Ummál">ummál</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 F}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi>F</mi> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle F}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/545fd099af8541605f7ee55f08225526be88ce57" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.338ex; width:1.741ex; height:2.176ex;" alt="{\displaystyle F}"></span> = <a href="/wiki/Flatarm%C3%A1l" title="Flatarmál">flatarmál</a> og <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 R}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi>R</mi> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle R}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/4b0bfb3769bf24d80e15374dc37b0441e2616e33" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.338ex; width:1.764ex; height:2.176ex;" alt="{\displaystyle R}"></span> = <a href="/wiki/R%C3%BAmm%C3%A1l" title="Rúmmál">rúmmál</a>. </p> <div class="mw-heading mw-heading3"><h3 id="Hringur">Hringur</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Geisli_(r%C3%BAmfr%C3%A6%C3%B0i)&veaction=edit&section=2" title="Breyti hluta: Hringur" class="mw-editsection-visualeditor"><span>breyta</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Geisli_(r%C3%BAmfr%C3%A6%C3%B0i)&action=edit&section=2" title="Edit section's source code: Hringur"><span>breyta frumkóða</span></a><span class="mw-editsection-bracket">]</span></span></div> <dl><dt>Geisli</dt> <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 r={\frac {U}{2\pi }}}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi>r</mi> <mo>=</mo> <mrow class="MJX-TeXAtom-ORD"> <mfrac> <mi>U</mi> <mrow> <mn>2</mn> <mi>π</mi> </mrow> </mfrac> </mrow> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle r={\frac {U}{2\pi }}}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/2bc012b2d3841e19ea6101b9dde109d82d25347b" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -1.838ex; width:7.478ex; height:5.176ex;" alt="{\displaystyle r={\frac {U}{2\pi }}}"></span></dd> <dt>Ummál</dt> <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 U=2r\pi }"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi>U</mi> <mo>=</mo> <mn>2</mn> <mi>r</mi> <mi>π</mi> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle U=2r\pi }</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/a7a19c82b738bccd3af17220380e663d531434ac" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.338ex; width:8.424ex; height:2.176ex;" alt="{\displaystyle U=2r\pi }"></span></dd> <dt>Flatarmál</dt> <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 F=\pi r^{2}}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi>F</mi> <mo>=</mo> <mi>π</mi> <msup> <mi>r</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>2</mn> </mrow> </msup> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle F=\pi r^{2}}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/8ee175ffc785b2f1d8a3af8f88feec3098b7993d" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.338ex; width:8.274ex; height:2.676ex;" alt="{\displaystyle F=\pi r^{2}}"></span></dd></dl> <div class="mw-heading mw-heading3"><h3 id="Kúla"><span id="K.C3.BAla"></span>Kúla</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Geisli_(r%C3%BAmfr%C3%A6%C3%B0i)&veaction=edit&section=3" title="Breyti hluta: Kúla" class="mw-editsection-visualeditor"><span>breyta</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Geisli_(r%C3%BAmfr%C3%A6%C3%B0i)&action=edit&section=3" title="Edit section's source code: Kúla"><span>breyta frumkóða</span></a><span class="mw-editsection-bracket">]</span></span></div> <dl><dt>Rúmmál</dt> <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 R={\frac {4\pi r^{3}}{3}}}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi>R</mi> <mo>=</mo> <mrow class="MJX-TeXAtom-ORD"> <mfrac> <mrow> <mn>4</mn> <mi>π</mi> <msup> <mi>r</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>3</mn> </mrow> </msup> </mrow> <mn>3</mn> </mfrac> </mrow> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle R={\frac {4\pi r^{3}}{3}}}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/ed5b15c3b3b0cd3e88356f7250f95051100d6d4f" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -1.838ex; width:10.296ex; height:5.676ex;" alt="{\displaystyle R={\frac {4\pi r^{3}}{3}}}"></span></dd> <dt>Flatarmál</dt> <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 F=4\pi r^{2}}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi>F</mi> <mo>=</mo> <mn>4</mn> <mi>π</mi> <msup> <mi>r</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>2</mn> </mrow> </msup> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle F=4\pi r^{2}}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/7ff4d975cc22cc954807b7ee1962abb2f3f04ec4" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.338ex; width:9.437ex; height:2.676ex;" alt="{\displaystyle F=4\pi r^{2}}"></span>.</dd></dl>    </div><noscript><img src="https://login.wikimedia.org/wiki/Special:CentralAutoLogin/start?type=1x1&useformat=desktop" alt="" width="1" height="1" style="border: none; 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