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[o]" accesskey="o" class=""><span>Skrá inn</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="Frekari valkostir" > <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="Persónuleg verkfæri" > <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">Persónuleg verkfæri</span> </label> <div class="vector-dropdown-content"> <div id="p-personal" class="vector-menu mw-portlet mw-portlet-personal user-links-collapsible-item" title="Notandavalmynd" > <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="https://donate.wikimedia.org/?wmf_source=donate&wmf_medium=sidebar&wmf_campaign=is.wikipedia.org&uselang=is"><span>Fjárframlög</span></a></li><li id="pt-createaccount" class="user-links-collapsible-item mw-list-item"><a href="/w/index.php?title=Kerfiss%C3%AD%C3%B0a:B%C3%BAa_til_a%C3%B0gang&returnto=Keilusni%C3%B0" title="Þú ert hvattur/hvött til að búa til aðgang og skrá þig inn; en það er ekki skylda"><span class="vector-icon mw-ui-icon-userAdd mw-ui-icon-wikimedia-userAdd"></span> <span>Búa til aðgang</span></a></li><li id="pt-login" class="user-links-collapsible-item mw-list-item"><a href="/w/index.php?title=Kerfiss%C3%AD%C3%B0a:Innskr%C3%A1&returnto=Keilusni%C3%B0" title="Þú ert hvattur/hvött til að innskrá þig, það er hinsvegar ekki skylda. [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 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="Vefsíða"> <div id="vector-main-menu-pinned-container" class="vector-pinned-container"> </div> </nav> </div> </div> </div> <div class="mw-content-container"> <main id="content" class="mw-body"> <header class="mw-body-header vector-page-titlebar"> <h1 id="firstHeading" class="firstHeading mw-first-heading"><span class="mw-page-title-main">Keilusnið</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 78 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-78" 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">78 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/Ke%C3%ABlsnit" title="Keëlsnit – afríkanska" lang="af" hreflang="af" data-title="Keëlsnit" data-language-autonym="Afrikaans" data-language-local-name="afríkanska" class="interlanguage-link-target"><span>Afrikaans</span></a></li><li class="interlanguage-link interwiki-am mw-list-item"><a href="https://am.wikipedia.org/wiki/%E1%8B%A8%E1%88%BE%E1%8C%A3%E1%8C%A3_%E1%8A%AD%E1%8D%8D%E1%88%8E%E1%89%BD" title="የሾጣጣ ክፍሎች – amharíska" lang="am" hreflang="am" data-title="የሾጣጣ ክፍሎች" data-language-autonym="አማርኛ" data-language-local-name="amharíska" class="interlanguage-link-target"><span>አማርኛ</span></a></li><li class="interlanguage-link interwiki-ar mw-list-item"><a href="https://ar.wikipedia.org/wiki/%D9%82%D8%B7%D8%B9_%D9%85%D8%AE%D8%B1%D9%88%D8%B7%D9%8A" title="قطع مخروطي – arabíska" lang="ar" hreflang="ar" data-title="قطع مخروطي" data-language-autonym="العربية" data-language-local-name="arabíska" class="interlanguage-link-target"><span>العربية</span></a></li><li class="interlanguage-link interwiki-arz mw-list-item"><a href="https://arz.wikipedia.org/wiki/%D8%A7%D9%84%D9%82%D8%B7%D9%88%D8%B9_%D8%A7%D9%84%D9%85%D8%AE%D8%B1%D9%88%D8%B7%D9%8A%D9%87" title="القطوع المخروطيه – Egyptian Arabic" lang="arz" hreflang="arz" data-title="القطوع المخروطيه" data-language-autonym="مصرى" data-language-local-name="Egyptian Arabic" class="interlanguage-link-target"><span>مصرى</span></a></li><li class="interlanguage-link interwiki-ast mw-list-item"><a href="https://ast.wikipedia.org/wiki/Seici%C3%B3n_c%C3%B3nica" title="Seición cónica – astúríska" lang="ast" hreflang="ast" data-title="Seición cónica" data-language-autonym="Asturianu" data-language-local-name="astúríska" class="interlanguage-link-target"><span>Asturianu</span></a></li><li class="interlanguage-link interwiki-be mw-list-item"><a href="https://be.wikipedia.org/wiki/%D0%9A%D0%B0%D0%BD%D1%96%D1%87%D0%BD%D0%B0%D0%B5_%D1%81%D1%8F%D1%87%D1%8D%D0%BD%D0%BD%D0%B5" title="Канічнае сячэнне – hvítrússneska" lang="be" hreflang="be" data-title="Канічнае сячэнне" 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%9A%D0%B0%D0%BD%D1%96%D1%87%D0%BD%D0%B0%D0%B5_%D1%81%D0%B5%D1%87%D1%8B%D0%B2%D0%B0" title="Канічнае сечыва – Belarusian (Taraškievica orthography)" lang="be-tarask" hreflang="be-tarask" data-title="Канічнае сечыва" 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%9A%D0%BE%D0%BD%D0%B8%D1%87%D0%BD%D0%BE_%D1%81%D0%B5%D1%87%D0%B5%D0%BD%D0%B8%D0%B5" title="Конично сечение – búlgarska" lang="bg" hreflang="bg" data-title="Конично сечение" 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%95%E0%A6%A8%E0%A6%BF%E0%A6%95" title="কনিক – bengalska" lang="bn" hreflang="bn" data-title="কনিক" data-language-autonym="বাংলা" data-language-local-name="bengalska" class="interlanguage-link-target"><span>বাংলা</span></a></li><li class="interlanguage-link interwiki-bs mw-list-item"><a href="https://bs.wikipedia.org/wiki/Konusni_presjek" title="Konusni presjek – bosníska" lang="bs" hreflang="bs" data-title="Konusni presjek" 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/C%C3%B2nica" title="Cònica – katalónska" lang="ca" hreflang="ca" data-title="Cònica" 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/%D8%A8%DA%95%DA%AF%DB%95%DB%8C_%D9%82%D9%88%D9%88%DA%86%DB%95%DA%A9%DB%8C" title="بڕگەی قووچەکی – miðkúrdíska" lang="ckb" hreflang="ckb" data-title="بڕگەی قووچەکی" 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/Ku%C5%BEelose%C4%8Dka" title="Kuželosečka – tékkneska" lang="cs" hreflang="cs" data-title="Kuželosečka" 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%9A%D0%BE%D0%BD%D1%83%D1%81%D0%BB%D0%B0_%D0%BA%D0%B0%D1%81%C4%83%D0%BB%D1%83" title="Конусла касăлу – sjúvas" lang="cv" hreflang="cv" data-title="Конусла касăлу" 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/Trychiad_conig" title="Trychiad conig – velska" lang="cy" hreflang="cy" data-title="Trychiad conig" 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/Keglesnit" title="Keglesnit – danska" lang="da" hreflang="da" data-title="Keglesnit" 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/Kegelschnitt" title="Kegelschnitt – þýska" lang="de" hreflang="de" data-title="Kegelschnitt" 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%9A%CF%89%CE%BD%CE%B9%CE%BA%CE%AE_%CF%84%CE%BF%CE%BC%CE%AE" title="Κωνική τομή – gríska" lang="el" hreflang="el" data-title="Κωνική τομή" data-language-autonym="Ελληνικά" data-language-local-name="gríska" class="interlanguage-link-target"><span>Ελληνικά</span></a></li><li class="interlanguage-link interwiki-en mw-list-item"><a href="https://en.wikipedia.org/wiki/Conic_section" title="Conic section – enska" lang="en" hreflang="en" data-title="Conic section" 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/Koniko" title="Koniko – esperantó" lang="eo" hreflang="eo" data-title="Koniko" 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/Secci%C3%B3n_c%C3%B3nica" title="Sección cónica – spænska" lang="es" hreflang="es" data-title="Sección cónica" 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/Koonusel%C3%B5ige" title="Koonuselõige – eistneska" lang="et" hreflang="et" data-title="Koonuselõige" 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/Koniko" title="Koniko – baskneska" lang="eu" hreflang="eu" data-title="Koniko" 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/%D9%85%D9%82%D8%B7%D8%B9_%D9%85%D8%AE%D8%B1%D9%88%D8%B7%DB%8C" title="مقطع مخروطی – persneska" lang="fa" hreflang="fa" data-title="مقطع مخروطی" 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/Kartioleikkaus" title="Kartioleikkaus – finnska" lang="fi" hreflang="fi" data-title="Kartioleikkaus" 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/Conique" title="Conique – franska" lang="fr" hreflang="fr" data-title="Conique" data-language-autonym="Français" data-language-local-name="franska" 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/C%C3%B3nghearradh" title="Cónghearradh – írska" lang="ga" hreflang="ga" data-title="Cónghearradh" data-language-autonym="Gaeilge" data-language-local-name="írska" 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/Secci%C3%B3n_c%C3%B3nica" title="Sección cónica – galisíska" lang="gl" hreflang="gl" data-title="Sección cónica" data-language-autonym="Galego" data-language-local-name="galisíska" class="interlanguage-link-target"><span>Galego</span></a></li><li class="interlanguage-link interwiki-he mw-list-item"><a href="https://he.wikipedia.org/wiki/%D7%97%D7%AA%D7%9A_%D7%97%D7%A8%D7%95%D7%98" title="חתך חרוט – hebreska" lang="he" hreflang="he" data-title="חתך חרוט" 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%B6%E0%A4%82%E0%A4%95%E0%A5%81-%E0%A4%AA%E0%A4%B0%E0%A4%BF%E0%A4%9A%E0%A5%8D%E0%A4%9B%E0%A5%87%E0%A4%A6" title="शंकु-परिच्छेद – hindí" lang="hi" hreflang="hi" data-title="शंकु-परिच्छेद" data-language-autonym="हिन्दी" data-language-local-name="hindí" class="interlanguage-link-target"><span>हिन्दी</span></a></li><li class="interlanguage-link interwiki-hr mw-list-item"><a href="https://hr.wikipedia.org/wiki/Krivulje_drugog_reda" title="Krivulje drugog reda – króatíska" lang="hr" hreflang="hr" data-title="Krivulje drugog reda" data-language-autonym="Hrvatski" data-language-local-name="króatíska" class="interlanguage-link-target"><span>Hrvatski</span></a></li><li class="interlanguage-link interwiki-hu mw-list-item"><a href="https://hu.wikipedia.org/wiki/K%C3%BApszelet" title="Kúpszelet – ungverska" lang="hu" hreflang="hu" data-title="Kúpszelet" data-language-autonym="Magyar" data-language-local-name="ungverska" 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/%D4%BF%D5%B8%D5%B6%D5%A1%D5%AF%D5%A1%D5%B6_%D5%B0%D5%A1%D5%BF%D5%B8%D6%82%D5%B5%D5%A9" title="Կոնական հատույթ – armenska" lang="hy" hreflang="hy" data-title="Կոնական հատույթ" data-language-autonym="Հայերեն" data-language-local-name="armenska" 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/Irisan_kerucut" title="Irisan kerucut – indónesíska" lang="id" hreflang="id" data-title="Irisan kerucut" 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-io mw-list-item"><a href="https://io.wikipedia.org/wiki/Koniko" title="Koniko – ídó" lang="io" hreflang="io" data-title="Koniko" data-language-autonym="Ido" data-language-local-name="ídó" 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/Sezione_conica" title="Sezione conica – ítalska" lang="it" hreflang="it" data-title="Sezione conica" 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%86%86%E9%8C%90%E6%9B%B2%E7%B7%9A" title="円錐曲線 – japanska" lang="ja" hreflang="ja" data-title="円錐曲線" 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-kab mw-list-item"><a href="https://kab.wikipedia.org/wiki/Uzmig" title="Uzmig – kabíle" lang="kab" hreflang="kab" data-title="Uzmig" 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%9A%D0%BE%D0%BD%D0%B8%D0%BA%D0%B0" title="Коника – kasakska" lang="kk" hreflang="kk" data-title="Коника" data-language-autonym="Қазақша" data-language-local-name="kasakska" class="interlanguage-link-target"><span>Қазақша</span></a></li><li class="interlanguage-link interwiki-kn mw-list-item"><a href="https://kn.wikipedia.org/wiki/%E0%B2%B6%E0%B2%82%E0%B2%95%E0%B3%81%E0%B2%9C%E0%B2%97%E0%B2%B3%E0%B3%81" title="ಶಂಕುಜಗಳು – kannada" lang="kn" hreflang="kn" data-title="ಶಂಕುಜಗಳು" data-language-autonym="ಕನ್ನಡ" data-language-local-name="kannada" class="interlanguage-link-target"><span>ಕನ್ನಡ</span></a></li><li class="interlanguage-link interwiki-ko mw-list-item"><a href="https://ko.wikipedia.org/wiki/%EC%9B%90%EB%BF%94_%EA%B3%A1%EC%84%A0" title="원뿔 곡선 – kóreska" lang="ko" hreflang="ko" data-title="원뿔 곡선" data-language-autonym="한국어" data-language-local-name="kóreska" 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/Sectio_conica" title="Sectio conica – latína" lang="la" hreflang="la" data-title="Sectio conica" data-language-autonym="Latina" data-language-local-name="latína" class="interlanguage-link-target"><span>Latina</span></a></li><li class="interlanguage-link interwiki-lt mw-list-item"><a href="https://lt.wikipedia.org/wiki/K%C5%ABgio_pj%C5%ABvis" title="Kūgio pjūvis – litháíska" lang="lt" hreflang="lt" data-title="Kūgio pjūvis" 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/Konusa_%C5%A1%C4%B7%C4%93lums" title="Konusa šķēlums – lettneska" lang="lv" hreflang="lv" data-title="Konusa šķēlums" data-language-autonym="Latviešu" data-language-local-name="lettneska" 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%9A%D0%BE%D0%BD%D1%83%D1%81%D0%B5%D0%BD_%D0%BF%D1%80%D0%B5%D1%81%D0%B5%D0%BA" title="Конусен пресек – makedónska" lang="mk" hreflang="mk" data-title="Конусен пресек" 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%B5%E0%B5%83%E0%B4%A4%E0%B5%8D%E0%B4%A4%E0%B4%B8%E0%B5%8D%E0%B4%A4%E0%B5%82%E0%B4%AA%E0%B4%BF%E0%B4%95%E0%B4%BE%E0%B4%96%E0%B4%A3%E0%B5%8D%E0%B4%A1%E0%B4%82" title="വൃത്തസ്തൂപികാഖണ്ഡം – malajalam" lang="ml" hreflang="ml" data-title="വൃത്തസ്തൂപികാഖണ്ഡം" data-language-autonym="മലയാളം" data-language-local-name="malajalam" class="interlanguage-link-target"><span>മലയാളം</span></a></li><li class="interlanguage-link interwiki-ms mw-list-item"><a href="https://ms.wikipedia.org/wiki/Keratan_kon" title="Keratan kon – malaíska" lang="ms" hreflang="ms" data-title="Keratan kon" 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-nl mw-list-item"><a href="https://nl.wikipedia.org/wiki/Kegelsnede" title="Kegelsnede – hollenska" lang="nl" hreflang="nl" data-title="Kegelsnede" 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/Kjeglesnitt" title="Kjeglesnitt – nýnorska" lang="nn" hreflang="nn" data-title="Kjeglesnitt" 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/Kjeglesnitt" title="Kjeglesnitt – norskt bókmál" lang="nb" hreflang="nb" data-title="Kjeglesnitt" 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/Conica" title="Conica – oksítaníska" lang="oc" hreflang="oc" data-title="Conica" 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/Kutaalee_Biilalee" title="Kutaalee Biilalee – oromo" lang="om" hreflang="om" data-title="Kutaalee Biilalee" data-language-autonym="Oromoo" data-language-local-name="oromo" class="interlanguage-link-target"><span>Oromoo</span></a></li><li class="interlanguage-link interwiki-pl mw-list-item"><a href="https://pl.wikipedia.org/wiki/Krzywa_sto%C5%BCkowa" title="Krzywa stożkowa – pólska" lang="pl" hreflang="pl" data-title="Krzywa stożkowa" data-language-autonym="Polski" data-language-local-name="pólska" class="interlanguage-link-target"><span>Polski</span></a></li><li class="interlanguage-link interwiki-pms mw-list-item"><a href="https://pms.wikipedia.org/wiki/C%C3%B2nica" title="Cònica – Piedmontese" lang="pms" hreflang="pms" data-title="Cònica" data-language-autonym="Piemontèis" data-language-local-name="Piedmontese" class="interlanguage-link-target"><span>Piemontèis</span></a></li><li class="interlanguage-link interwiki-pt mw-list-item"><a href="https://pt.wikipedia.org/wiki/C%C3%B3nica" title="Cónica – portúgalska" lang="pt" hreflang="pt" data-title="Cónica" data-language-autonym="Português" data-language-local-name="portúgalska" 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/Conic%C4%83" title="Conică – rúmenska" lang="ro" hreflang="ro" data-title="Conică" 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%9A%D0%BE%D0%BD%D0%B8%D1%87%D0%B5%D1%81%D0%BA%D0%BE%D0%B5_%D1%81%D0%B5%D1%87%D0%B5%D0%BD%D0%B8%D0%B5" title="Коническое сечение – rússneska" lang="ru" hreflang="ru" data-title="Коническое сечение" data-language-autonym="Русский" data-language-local-name="rússneska" class="interlanguage-link-target"><span>Русский</span></a></li><li class="interlanguage-link interwiki-rue mw-list-item"><a href="https://rue.wikipedia.org/wiki/%D0%9A%D0%BE%D0%BD%D0%B8%D1%87%D0%BD%D1%8B_%D0%BF%D0%B5%D1%80%D0%B5%D1%80%D1%A3%D0%B7%D1%8B" title="Коничны перерѣзы – Rusyn" lang="rue" hreflang="rue" data-title="Коничны перерѣзы" data-language-autonym="Русиньскый" data-language-local-name="Rusyn" class="interlanguage-link-target"><span>Русиньскый</span></a></li><li class="interlanguage-link interwiki-scn mw-list-item"><a href="https://scn.wikipedia.org/wiki/Conica" title="Conica – sikileyska" lang="scn" hreflang="scn" data-title="Conica" data-language-autonym="Sicilianu" data-language-local-name="sikileyska" class="interlanguage-link-target"><span>Sicilianu</span></a></li><li class="interlanguage-link interwiki-sh mw-list-item"><a href="https://sh.wikipedia.org/wiki/Konusni_presjek" title="Konusni presjek – serbókróatíska" lang="sh" hreflang="sh" data-title="Konusni presjek" 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-simple mw-list-item"><a href="https://simple.wikipedia.org/wiki/Conic_section" title="Conic section – Simple English" lang="en-simple" hreflang="en-simple" data-title="Conic section" 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/Ku%C5%BEe%C4%BEose%C4%8Dka" title="Kužeľosečka – slóvakíska" lang="sk" hreflang="sk" data-title="Kužeľosečka" 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/Sto%C5%BEnica" title="Stožnica – slóvenska" lang="sl" hreflang="sl" data-title="Stožnica" data-language-autonym="Slovenščina" data-language-local-name="slóvenska" class="interlanguage-link-target"><span>Slovenščina</span></a></li><li class="interlanguage-link interwiki-sq mw-list-item"><a href="https://sq.wikipedia.org/wiki/Prerjet_konike" title="Prerjet konike – albanska" lang="sq" hreflang="sq" data-title="Prerjet konike" 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%9A%D0%BE%D0%BD%D1%83%D1%81%D0%BD%D0%B8_%D0%BF%D1%80%D0%B5%D1%81%D0%B5%D0%BA" title="Конусни пресек – serbneska" lang="sr" hreflang="sr" data-title="Конусни пресек" 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-su mw-list-item"><a href="https://su.wikipedia.org/wiki/Siksikan_congcot" title="Siksikan congcot – súndanska" lang="su" hreflang="su" data-title="Siksikan congcot" data-language-autonym="Sunda" data-language-local-name="súndanska" class="interlanguage-link-target"><span>Sunda</span></a></li><li class="interlanguage-link interwiki-sv mw-list-item"><a href="https://sv.wikipedia.org/wiki/K%C3%A4gelsnitt" title="Kägelsnitt – sænska" lang="sv" hreflang="sv" data-title="Kägelsnitt" data-language-autonym="Svenska" data-language-local-name="sænska" 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%95%E0%AF%82%E0%AE%AE%E0%AF%8D%E0%AE%AA%E0%AF%81_%E0%AE%B5%E0%AF%86%E0%AE%9F%E0%AF%8D%E0%AE%9F%E0%AF%81" title="கூம்பு வெட்டு – tamílska" lang="ta" hreflang="ta" data-title="கூம்பு வெட்டு" data-language-autonym="தமிழ்" data-language-local-name="tamílska" 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%A0%E0%B8%B2%E0%B8%84%E0%B8%95%E0%B8%B1%E0%B8%94%E0%B8%81%E0%B8%A3%E0%B8%A7%E0%B8%A2" title="ภาคตัดกรวย – taílenska" lang="th" hreflang="th" data-title="ภาคตัดกรวย" data-language-autonym="ไทย" data-language-local-name="taílenska" class="interlanguage-link-target"><span>ไทย</span></a></li><li class="interlanguage-link interwiki-tr mw-list-item"><a href="https://tr.wikipedia.org/wiki/Konikler" title="Konikler – tyrkneska" lang="tr" hreflang="tr" data-title="Konikler" data-language-autonym="Türkçe" data-language-local-name="tyrkneska" 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%9A%D0%BE%D0%BD%D1%96%D1%87%D0%BD%D1%96_%D0%BF%D0%B5%D1%80%D0%B5%D1%82%D0%B8%D0%BD%D0%B8" title="Конічні перетини – úkraínska" lang="uk" hreflang="uk" data-title="Конічні перетини" 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%AA%DA%A9%D9%88%D9%86%DB%8C_%D9%82%D8%B7%D8%B9%D8%A7%D8%AA" title="تکونی قطعات – úrdú" lang="ur" hreflang="ur" data-title="تکونی قطعات" 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/Konus_kesimlari" title="Konus kesimlari – úsbekska" lang="uz" hreflang="uz" data-title="Konus kesimlari" 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/%C4%90%C6%B0%E1%BB%9Dng_conic" title="Đường conic – víetnamska" lang="vi" hreflang="vi" data-title="Đường conic" 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%9C%86%E9%94%A5%E6%9B%B2%E7%BA%BF" title="圆锥曲线 – wu-kínverska" lang="wuu" hreflang="wuu" data-title="圆锥曲线" 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-zh mw-list-item"><a href="https://zh.wikipedia.org/wiki/%E5%9C%86%E9%94%A5%E6%9B%B2%E7%BA%BF" title="圆锥曲线 – kínverska" lang="zh" hreflang="zh" data-title="圆锥曲线" 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-classical mw-list-item"><a href="https://zh-classical.wikipedia.org/wiki/%E5%9C%93%E9%8C%90%E6%9B%B2%E7%B7%9A" title="圓錐曲線 – Literary Chinese" lang="lzh" hreflang="lzh" data-title="圓錐曲線" data-language-autonym="文言" data-language-local-name="Literary Chinese" class="interlanguage-link-target"><span>文言</span></a></li><li class="interlanguage-link interwiki-zh-yue mw-list-item"><a href="https://zh-yue.wikipedia.org/wiki/%E5%9C%93%E9%8C%90%E6%9B%B2%E7%B6%AB" title="圓錐曲綫 – kantónska" lang="yue" hreflang="yue" data-title="圓錐曲綫" 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/Q124255#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/Keilusni%C3%B0" title="Sýna efnissíðuna [c]" accesskey="c"><span>Síða</span></a></li><li id="ca-talk" class="vector-tab-noicon mw-list-item"><a href="/wiki/Spjall:Keilusni%C3%B0" rel="discussion" title="Spallsíða þessarar síðu [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 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vector-more-collapsible-item mw-list-item"><a href="/wiki/Keilusni%C3%B0"><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=Keilusni%C3%B0&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=Keilusni%C3%B0&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=Keilusni%C3%B0&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/Keilusni%C3%B0" 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/Keilusni%C3%B0" 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=Keilusni%C3%B0&oldid=1384838" title="Varanlegur tengill í þessa útgáfu síðunnar"><span>Varanlegur tengill</span></a></li><li id="t-info" 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<div id="mw-content-text" class="mw-body-content"><div class="mw-content-ltr mw-parser-output" lang="is" dir="ltr"><figure class="mw-halign-right" typeof="mw:File/Thumb"><a href="/wiki/Mynd:Conic_sections_with_plane.svg" class="mw-file-description"><img alt=""keilusnið"" src="//upload.wikimedia.org/wikipedia/commons/thumb/d/d3/Conic_sections_with_plane.svg/450px-Conic_sections_with_plane.svg.png" decoding="async" width="450" height="263" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/d/d3/Conic_sections_with_plane.svg/675px-Conic_sections_with_plane.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/d/d3/Conic_sections_with_plane.svg/900px-Conic_sections_with_plane.svg.png 2x" data-file-width="600" data-file-height="350" /></a><figcaption>Hérna sést hvernig plan sem sker keilu myndar mismunandi keilusnið (blágrænu ferlarnir sem myndast þar sem planið sker keiluna) eftir því hvar planið og keilan skerast. Á fyrstu myndinni er sýnt hvernig fleygbogi myndast, næst er það sporbaugur og hringur, að lokum er það breiðbogi.</figcaption></figure> <p><b>Keilusnið</b> er í <a href="/wiki/R%C3%BAmfr%C3%A6%C3%B0i" title="Rúmfræði">rúmfræði</a> heiti þriggja <a href="/wiki/Ferill" title="Ferill">ferla</a>, sem myndast þegar <a href="/wiki/Sl%C3%A9tta_(r%C3%BAmfr%C3%A6%C3%B0i)" title="Slétta (rúmfræði)">slétta</a> sníður <a href="/wiki/Keila_(r%C3%BAmfr%C3%A6%C3%B0i)" title="Keila (rúmfræði)">keilu</a>, en þau eru: </p> <ul><li><a href="/wiki/Sporbaugur" title="Sporbaugur">sporbaugur</a> (þar sem <a href="/wiki/Hringur_(r%C3%BAmfr%C3%A6%C3%B0i)" title="Hringur (rúmfræði)">hringur</a> er sértilvik),</li> <li><a href="/wiki/Fleygbogi" title="Fleygbogi">fleygbogi</a> og</li> <li><a href="/wiki/Brei%C3%B0bogi" title="Breiðbogi">breiðbogi</a>.</li></ul> <p>Almenn jafna fyrir keilusnið er á forminu: </p><p><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 Ax^{2}+Bxy+Cy^{2}+Dx+Ey+F=0}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi>A</mi> <msup> <mi>x</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>2</mn> </mrow> </msup> <mo>+</mo> <mi>B</mi> <mi>x</mi> <mi>y</mi> <mo>+</mo> <mi>C</mi> <msup> <mi>y</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>2</mn> </mrow> </msup> <mo>+</mo> <mi>D</mi> <mi>x</mi> <mo>+</mo> <mi>E</mi> <mi>y</mi> <mo>+</mo> <mi>F</mi> <mo>=</mo> <mn>0</mn> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle Ax^{2}+Bxy+Cy^{2}+Dx+Ey+F=0}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/a694f3a0805f2f11868a2a69413866d64170409b" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.671ex; width:38.746ex; height:3.009ex;" alt="{\displaystyle Ax^{2}+Bxy+Cy^{2}+Dx+Ey+F=0}"></span> </p><p>þar sem <i>A</i>, <i>B</i>, <i>C</i>, <i>D</i>, <i>E</i> og <i>F</i> eru <a href="/wiki/Rauntala" title="Rauntala">rauntölur</a>, <i>A</i>, <i>B</i> og <i>C</i> eru ekki allar 0 en <i>D</i>, <i>E</i> og <i>F</i> geta verið 0. </p>    </div><noscript><img src="https://login.wikimedia.org/wiki/Special:CentralAutoLogin/start?useformat=desktop&type=1x1&usesul3=0" alt="" width="1" height="1" style="border: none; position: absolute;"></noscript> <div class="printfooter" data-nosnippet="">Sótt frá „<a dir="ltr" href="https://is.wikipedia.org/w/index.php?title=Keilusnið&oldid=1384838">https://is.wikipedia.org/w/index.php?title=Keilusnið&oldid=1384838</a>“</div></div> <div id="catlinks" class="catlinks" data-mw="interface"><div id="mw-normal-catlinks" class="mw-normal-catlinks"><a href="/wiki/Kerfiss%C3%AD%C3%B0a:Flokkar" title="Kerfissíða:Flokkar">Flokkur</a>: <ul><li><a href="/wiki/Flokkur:R%C3%BAmfr%C3%A6%C3%B0i" title="Flokkur:Rúmfræði">Rúmfræði</a></li></ul></div></div> </div> </main> </div> <div class="mw-footer-container"> <footer id="footer" class="mw-footer" > <ul id="footer-info"> <li id="footer-info-lastmod"> Þessari síðu var síðast breytt 9. mars 2013, klukkan 01:37.</li> <li id="footer-info-copyright">Textinn er gefinn út samkvæmt <a href="/wiki/Wikipedia:H%C3%B6fundar%C3%A9ttur" title="Wikipedia:Höfundaréttur">Creative Commons Tilvísun-DeilaEins leyfi</a>. 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