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href="/w/index.php?title=Special:%E7%94%A8%E6%88%B7%E7%99%BB%E5%BD%95&returnto=%E5%9C%93%E5%91%A8" title="建议你登录，尽管并非必须。[o]" accesskey="o"><span class="vector-icon mw-ui-icon-logIn mw-ui-icon-wikimedia-logIn"></span> <span>登录</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"> 未登录编辑者的页面 <a href="/wiki/Help:%E6%96%B0%E6%89%8B%E5%85%A5%E9%97%A8" aria-label="了解有关编辑的更多信息"><span>了解详情</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/Special:%E6%88%91%E7%9A%84%E8%B4%A1%E7%8C%AE" title="来自此IP地址的编辑列表[y]" accesskey="y"><span>贡献</span></a></li><li id="pt-anontalk" class="mw-list-item"><a href="/wiki/Special:%E6%88%91%E7%9A%84%E8%AE%A8%E8%AE%BA%E9%A1%B5" title="对于来自此IP地址编辑的讨论[n]" accesskey="n"><span>讨论</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="站点"> <div id="vector-main-menu-pinned-container" class="vector-pinned-container"> </div> </nav> </div> </div> <div class="vector-sticky-pinned-container"> <nav id="mw-panel-toc" aria-label="目录" data-event-name="ui.sidebar-toc" class="mw-table-of-contents-container vector-toc-landmark"> <div id="vector-toc-pinned-container" class="vector-pinned-container"> <div id="vector-toc" class="vector-toc vector-pinnable-element"> <div class="vector-pinnable-header vector-toc-pinnable-header vector-pinnable-header-pinned" data-feature-name="toc-pinned" data-pinnable-element-id="vector-toc" > <h2 class="vector-pinnable-header-label">目录</h2> <button class="vector-pinnable-header-toggle-button 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<span>图论中的周長</span> </div> </a> <ul id="toc-图论中的周長-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-相關條目" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#相關條目"> <div class="vector-toc-text"> <span class="vector-toc-numb">3</span> <span>相關條目</span> </div> </a> <ul id="toc-相關條目-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-參考資料" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#參考資料"> <div class="vector-toc-text"> <span class="vector-toc-numb">4</span> <span>參考資料</span> </div> </a> <ul id="toc-參考資料-sublist" class="vector-toc-list"> </ul> </li> </ul> </div> </div> </nav> </div> </div> <div class="mw-content-container"> <main id="content" class="mw-body"> <header class="mw-body-header vector-page-titlebar"> <nav aria-label="目录" 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="开关目录" > <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">开关目录</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">圓周</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="前往另一种语言写成的文章。44种语言可用" > <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-44" 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">44种语言</span> </label> <div class="vector-dropdown-content"> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li class="interlanguage-link interwiki-ar mw-list-item"><a href="https://ar.wikipedia.org/wiki/%D9%85%D8%AD%D9%8A%D8%B7_%D9%85%D9%86%D8%AD%D9%86%D9%89_%D9%85%D8%BA%D9%84%D9%82" title="محيط منحنى مغلق – 阿拉伯语" lang="ar" hreflang="ar" data-title="محيط منحنى مغلق" data-language-autonym="العربية" data-language-local-name="阿拉伯语" class="interlanguage-link-target"><span>العربية</span></a></li><li class="interlanguage-link interwiki-as mw-list-item"><a href="https://as.wikipedia.org/wiki/%E0%A6%AA%E0%A7%B0%E0%A6%BF%E0%A6%A7%E0%A6%BF" title="পৰিধি – 阿萨姆语" lang="as" hreflang="as" data-title="পৰিধি" data-language-autonym="অসমীয়া" data-language-local-name="阿萨姆语" class="interlanguage-link-target"><span>অসমীয়া</span></a></li><li class="interlanguage-link interwiki-bg mw-list-item"><a href="https://bg.wikipedia.org/wiki/%D0%9E%D0%B1%D0%B8%D0%BA%D0%BE%D0%BB%D0%BA%D0%B0" title="Обиколка – 保加利亚语" lang="bg" hreflang="bg" data-title="Обиколка" data-language-autonym="Български" data-language-local-name="保加利亚语" 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%AA%E0%A6%B0%E0%A6%BF%E0%A6%A7%E0%A6%BF" title="পরিধি – 孟加拉语" lang="bn" hreflang="bn" data-title="পরিধি" data-language-autonym="বাংলা" data-language-local-name="孟加拉语" class="interlanguage-link-target"><span>বাংলা</span></a></li><li class="interlanguage-link interwiki-cy mw-list-item"><a href="https://cy.wikipedia.org/wiki/Cylchedd" title="Cylchedd – 威尔士语" lang="cy" hreflang="cy" data-title="Cylchedd" data-language-autonym="Cymraeg" data-language-local-name="威尔士语" class="interlanguage-link-target"><span>Cymraeg</span></a></li><li class="interlanguage-link interwiki-de badge-Q70894304 mw-list-item" title=""><a href="https://de.wikipedia.org/wiki/Kreisumfang" title="Kreisumfang – 德语" lang="de" hreflang="de" data-title="Kreisumfang" data-language-autonym="Deutsch" data-language-local-name="德语" 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%A0%CE%B5%CF%81%CE%B9%CF%86%CE%AD%CF%81%CE%B5%CE%B9%CE%B1_(%CE%B3%CE%B5%CF%89%CE%BC%CE%B5%CF%84%CF%81%CE%AF%CE%B1)" title="Περιφέρεια (γεωμετρία) – 希腊语" lang="el" hreflang="el" data-title="Περιφέρεια (γεωμετρία)" data-language-autonym="Ελληνικά" data-language-local-name="希腊语" 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/Circumference" title="Circumference – 英语" lang="en" hreflang="en" data-title="Circumference" data-language-autonym="English" data-language-local-name="英语" class="interlanguage-link-target"><span>English</span></a></li><li class="interlanguage-link interwiki-es mw-list-item"><a href="https://es.wikipedia.org/wiki/Circunferencia" title="Circunferencia – 西班牙语" lang="es" hreflang="es" data-title="Circunferencia" data-language-autonym="Español" data-language-local-name="西班牙语" class="interlanguage-link-target"><span>Español</span></a></li><li class="interlanguage-link interwiki-eu mw-list-item"><a href="https://eu.wikipedia.org/wiki/Zirkunferentzia" title="Zirkunferentzia – 巴斯克语" lang="eu" hreflang="eu" data-title="Zirkunferentzia" data-language-autonym="Euskara" data-language-local-name="巴斯克语" 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%D8%AD%DB%8C%D8%B7_%D9%85%D9%86%D8%AD%D9%86%DB%8C" title="محیط منحنی – 波斯语" lang="fa" hreflang="fa" data-title="محیط منحنی" data-language-autonym="فارسی" data-language-local-name="波斯语" 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/Keh%C3%A4_(geometria)" title="Kehä (geometria) – 芬兰语" lang="fi" hreflang="fi" data-title="Kehä (geometria)" data-language-autonym="Suomi" data-language-local-name="芬兰语" 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/Circonf%C3%A9rence" title="Circonférence – 法语" lang="fr" hreflang="fr" data-title="Circonférence" data-language-autonym="Français" data-language-local-name="法语" 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/Iml%C3%ADne" title="Imlíne – 爱尔兰语" lang="ga" hreflang="ga" data-title="Imlíne" data-language-autonym="Gaeilge" data-language-local-name="爱尔兰语" class="interlanguage-link-target"><span>Gaeilge</span></a></li><li class="interlanguage-link interwiki-gu mw-list-item"><a href="https://gu.wikipedia.org/wiki/%E0%AA%B5%E0%AA%B0%E0%AB%8D%E0%AA%A4%E0%AB%81%E0%AA%B3%E0%AA%A8%E0%AB%8B_%E0%AA%AA%E0%AA%B0%E0%AA%BF%E0%AA%98" title="વર્તુળનો પરિઘ – 古吉拉特语" lang="gu" hreflang="gu" data-title="વર્તુળનો પરિઘ" data-language-autonym="ગુજરાતી" data-language-local-name="古吉拉特语" class="interlanguage-link-target"><span>ગુજરાતી</span></a></li><li class="interlanguage-link interwiki-hi mw-list-item"><a href="https://hi.wikipedia.org/wiki/%E0%A4%AA%E0%A4%B0%E0%A4%BF%E0%A4%A7%E0%A4%BF" title="परिधि – 印地语" lang="hi" hreflang="hi" data-title="परिधि" data-language-autonym="हिन्दी" data-language-local-name="印地语" 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%D6%80%D5%BB%D5%A1%D5%B6%D5%A1%D5%A3%D5%AE%D5%AB_%D5%A5%D6%80%D5%AF%D5%A1%D6%80%D5%B8%D6%82%D5%A9%D5%B5%D5%B8%D6%82%D5%B6" title="Շրջանագծի երկարություն – 亚美尼亚语" lang="hy" hreflang="hy" data-title="Շրջանագծի երկարություն" data-language-autonym="Հայերեն" data-language-local-name="亚美尼亚语" 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/Circumferentia" title="Circumferentia – 国际语" lang="ia" hreflang="ia" data-title="Circumferentia" data-language-autonym="Interlingua" data-language-local-name="国际语" 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/Keliling_lingkaran" title="Keliling lingkaran – 印度尼西亚语" lang="id" hreflang="id" data-title="Keliling lingkaran" data-language-autonym="Bahasa Indonesia" data-language-local-name="印度尼西亚语" class="interlanguage-link-target"><span>Bahasa Indonesia</span></a></li><li class="interlanguage-link interwiki-is mw-list-item"><a href="https://is.wikipedia.org/wiki/Umm%C3%A1l" title="Ummál – 冰岛语" lang="is" hreflang="is" data-title="Ummál" data-language-autonym="Íslenska" data-language-local-name="冰岛语" class="interlanguage-link-target"><span>Íslenska</span></a></li><li class="interlanguage-link interwiki-ja mw-list-item"><a href="https://ja.wikipedia.org/wiki/%E5%86%86%E5%91%A8" title="円周 – 日语" lang="ja" hreflang="ja" data-title="円周" data-language-autonym="日本語" data-language-local-name="日语" 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/Tase%C9%A3leyt" title="Taseɣleyt – 卡拜尔语" lang="kab" hreflang="kab" data-title="Taseɣleyt" data-language-autonym="Taqbaylit" data-language-local-name="卡拜尔语" class="interlanguage-link-target"><span>Taqbaylit</span></a></li><li class="interlanguage-link interwiki-kn mw-list-item"><a href="https://kn.wikipedia.org/wiki/%E0%B2%AA%E0%B2%B0%E0%B2%BF%E0%B2%A7%E0%B2%BF" title="ಪರಿಧಿ – 卡纳达语" lang="kn" hreflang="kn" data-title="ಪರಿಧಿ" data-language-autonym="ಕನ್ನಡ" data-language-local-name="卡纳达语" 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%91%98%EB%A0%88" title="원둘레 – 韩语" lang="ko" hreflang="ko" data-title="원둘레" data-language-autonym="한국어" data-language-local-name="韩语" 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/Circumferentia" title="Circumferentia – 拉丁语" lang="la" hreflang="la" data-title="Circumferentia" data-language-autonym="Latina" data-language-local-name="拉丁语" class="interlanguage-link-target"><span>Latina</span></a></li><li class="interlanguage-link interwiki-lg mw-list-item"><a href="https://lg.wikipedia.org/wiki/Obwetoloovu_(Circumference)" title="Obwetoloovu (Circumference) – 卢干达语" lang="lg" hreflang="lg" data-title="Obwetoloovu (Circumference)" data-language-autonym="Luganda" data-language-local-name="卢干达语" class="interlanguage-link-target"><span>Luganda</span></a></li><li class="interlanguage-link interwiki-lt mw-list-item"><a href="https://lt.wikipedia.org/wiki/Apskritimo_ilgis" title="Apskritimo ilgis – 立陶宛语" lang="lt" hreflang="lt" data-title="Apskritimo ilgis" data-language-autonym="Lietuvių" data-language-local-name="立陶宛语" class="interlanguage-link-target"><span>Lietuvių</span></a></li><li class="interlanguage-link interwiki-mk mw-list-item"><a href="https://mk.wikipedia.org/wiki/%D0%9E%D0%B1%D0%B8%D0%BA%D0%BE%D0%BB%D0%BA%D0%B0_(%D0%B3%D0%B5%D0%BE%D0%BC%D0%B5%D1%82%D1%80%D0%B8%D1%98%D0%B0)" title="Обиколка (геометрија) – 马其顿语" lang="mk" hreflang="mk" data-title="Обиколка (геометрија)" data-language-autonym="Македонски" data-language-local-name="马其顿语" class="interlanguage-link-target"><span>Македонски</span></a></li><li class="interlanguage-link interwiki-mr mw-list-item"><a href="https://mr.wikipedia.org/wiki/%E0%A4%AA%E0%A4%B0%E0%A5%80%E0%A4%98" title="परीघ – 马拉地语" lang="mr" hreflang="mr" data-title="परीघ" data-language-autonym="मराठी" data-language-local-name="马拉地语" class="interlanguage-link-target"><span>मराठी</span></a></li><li class="interlanguage-link interwiki-oc mw-list-item"><a href="https://oc.wikipedia.org/wiki/Circonfer%C3%A9ncia" title="Circonferéncia – 奥克语" lang="oc" hreflang="oc" data-title="Circonferéncia" data-language-autonym="Occitan" data-language-local-name="奥克语" class="interlanguage-link-target"><span>Occitan</span></a></li><li class="interlanguage-link interwiki-pms mw-list-item"><a href="https://pms.wikipedia.org/wiki/Sirconferensa" title="Sirconferensa – 皮埃蒙特文" lang="pms" hreflang="pms" data-title="Sirconferensa" data-language-autonym="Piemontèis" data-language-local-name="皮埃蒙特文" 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/Comprimento_da_circunfer%C3%AAncia" title="Comprimento da circunferência – 葡萄牙语" lang="pt" hreflang="pt" data-title="Comprimento da circunferência" data-language-autonym="Português" data-language-local-name="葡萄牙语" 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/Circumferin%C8%9B%C4%83" title="Circumferință – 罗马尼亚语" lang="ro" hreflang="ro" data-title="Circumferință" data-language-autonym="Română" data-language-local-name="罗马尼亚语" 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%94%D0%BB%D0%B8%D0%BD%D0%B0_%D0%BE%D0%BA%D1%80%D1%83%D0%B6%D0%BD%D0%BE%D1%81%D1%82%D0%B8" title="Длина окружности – 俄语" lang="ru" hreflang="ru" data-title="Длина окружности" data-language-autonym="Русский" data-language-local-name="俄语" class="interlanguage-link-target"><span>Русский</span></a></li><li class="interlanguage-link interwiki-scn mw-list-item"><a href="https://scn.wikipedia.org/wiki/Circunfirenza" title="Circunfirenza – 西西里语" lang="scn" hreflang="scn" data-title="Circunfirenza" data-language-autonym="Sicilianu" data-language-local-name="西西里语" class="interlanguage-link-target"><span>Sicilianu</span></a></li><li class="interlanguage-link interwiki-simple mw-list-item"><a href="https://simple.wikipedia.org/wiki/Circumference" title="Circumference – Simple English" lang="en-simple" hreflang="en-simple" data-title="Circumference" 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-sw mw-list-item"><a href="https://sw.wikipedia.org/wiki/Mzingo_(jiometria)" title="Mzingo (jiometria) – 斯瓦希里语" lang="sw" hreflang="sw" data-title="Mzingo (jiometria)" data-language-autonym="Kiswahili" data-language-local-name="斯瓦希里语" class="interlanguage-link-target"><span>Kiswahili</span></a></li><li class="interlanguage-link interwiki-th mw-list-item"><a href="https://th.wikipedia.org/wiki/%E0%B9%80%E0%B8%AA%E0%B9%89%E0%B8%99%E0%B8%A3%E0%B8%AD%E0%B8%9A%E0%B8%A7%E0%B8%87" title="เส้นรอบวง – 泰语" lang="th" hreflang="th" data-title="เส้นรอบวง" data-language-autonym="ไทย" data-language-local-name="泰语" 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/Sirkumperensiya" title="Sirkumperensiya – 他加禄语" lang="tl" hreflang="tl" data-title="Sirkumperensiya" data-language-autonym="Tagalog" data-language-local-name="他加禄语" 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/%C3%87evre_(geometri)" title="Çevre (geometri) – 土耳其语" lang="tr" hreflang="tr" data-title="Çevre (geometri)" data-language-autonym="Türkçe" data-language-local-name="土耳其语" 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%9E%D0%BA%D1%80%D1%83%D0%B6%D0%BD%D1%96%D1%81%D1%82%D1%8C" title="Окружність – 乌克兰语" lang="uk" hreflang="uk" data-title="Окружність" data-language-autonym="Українська" data-language-local-name="乌克兰语" class="interlanguage-link-target"><span>Українська</span></a></li><li class="interlanguage-link interwiki-vi mw-list-item"><a href="https://vi.wikipedia.org/wiki/Chu_vi_h%C3%ACnh_tr%C3%B2n" title="Chu vi hình tròn – 越南语" lang="vi" hreflang="vi" data-title="Chu vi hình tròn" data-language-autonym="Tiếng Việt" data-language-local-name="越南语" class="interlanguage-link-target"><span>Tiếng Việt</span></a></li><li class="interlanguage-link interwiki-za mw-list-item"><a href="https://za.wikipedia.org/wiki/Hopluenz" title="Hopluenz – 壮语" lang="za" hreflang="za" data-title="Hopluenz" data-language-autonym="Vahcuengh" data-language-local-name="壮语" class="interlanguage-link-target"><span>Vahcuengh</span></a></li><li class="interlanguage-link interwiki-zh-yue mw-list-item"><a href="https://zh-yue.wikipedia.org/wiki/%E5%9C%93%E5%91%A8" title="圓周 – 粤语" lang="yue" hreflang="yue" data-title="圓周" data-language-autonym="粵語" data-language-local-name="粤语" 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/Q843905#sitelinks-wikipedia" title="编辑跨语言链接" class="wbc-editpage">编辑链接</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="命名空间"> <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/%E5%9C%93%E5%91%A8" title="浏览条目正文[c]" accesskey="c"><span>条目</span></a></li><li id="ca-talk" class="vector-tab-noicon mw-list-item"><a href="/wiki/Talk:%E5%9C%93%E5%91%A8" rel="discussion" title="关于此页面的讨论[t]" accesskey="t"><span>讨论</span></a></li> </ul> </div> </div> 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data-feature-name="page-tools-pinned" data-pinnable-element-id="vector-page-tools" data-pinned-container-id="vector-page-tools-pinned-container" data-unpinned-container-id="vector-page-tools-unpinned-container" > <div class="vector-pinnable-header-label">工具</div> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-pin-button" data-event-name="pinnable-header.vector-page-tools.pin">移至侧栏</button> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-unpin-button" data-event-name="pinnable-header.vector-page-tools.unpin">隐藏</button> </div> <div id="p-cactions" class="vector-menu mw-portlet mw-portlet-cactions emptyPortlet vector-has-collapsible-items" title="更多选项" > <div class="vector-menu-heading"> 操作 </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="ca-more-view" class="selected vector-more-collapsible-item mw-list-item"><a href="/wiki/%E5%9C%93%E5%91%A8"><span>阅读</span></a></li><li id="ca-more-edit" 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.mw-parser-output .sidebar:not(.notheme) .sidebar-pretitle,html.skin-theme-clientpref-os .mw-parser-output .sidebar:not(.notheme) .sidebar-title,html.skin-theme-clientpref-os .mw-parser-output .sidebar:not(.notheme) .sidebar-title-with-pretitle,html.skin-theme-clientpref-os .mw-parser-output .sidebar:not(.notheme) .sidebar-heading,html.skin-theme-clientpref-os .mw-parser-output .sidebar:not(.notheme) .sidebar-above,html.skin-theme-clientpref-os .mw-parser-output .sidebar:not(.notheme) .sidebar-below{background:inherit!important;color:inherit!important;border-color:#54595d!important}html.skin-theme-clientpref-os .mw-parser-output .sidebar a:not(.new):not(.mw-selflink):link{color:var(--color-progressive)!important}}@media print{body.ns-0 .mw-parser-output .sidebar{display:none!important}}</style><table class="sidebar nomobile nowraplinks hlist" style="width:200px"><tbody><tr><th class="sidebar-title" style="font-size:130%;"><a href="/wiki/%E5%9C%93%E5%91%A8%E7%8E%87" title="圓周率">圓周率</a></th></tr><tr><td class="sidebar-image"><span class="mw-default-size" typeof="mw:File/Frameless"><span><img src="//upload.wikimedia.org/wikipedia/commons/thumb/2/2a/Pi-unrolled-720.gif/220px-Pi-unrolled-720.gif" decoding="async" width="220" height="70" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/2/2a/Pi-unrolled-720.gif/330px-Pi-unrolled-720.gif 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/2/2a/Pi-unrolled-720.gif/440px-Pi-unrolled-720.gif 2x" data-file-width="720" data-file-height="228" /></span></span></td></tr><tr><td class="sidebar-content"> <b><span style="white-space:nowrap">3.14159<span style="margin-left:0.25em">26535</span><span style="margin-left:0.25em">89793</span><span style="margin-left:0.25em">23846</span><span style="margin-left:0.25em">26433...</span></span></b></td> </tr><tr><th class="sidebar-heading" style="border-top:#aaa 1px solid;"> 運用</th></tr><tr><td class="sidebar-content"> <ul><li><a href="/wiki/%E5%9C%86%E7%9A%84%E9%9D%A2%E7%A7%AF" title="圆的面积">圓的面積</a></li> <li><a class="mw-selflink selflink">周長</a></li> <li><a href="/wiki/%E5%90%AB%E5%9C%86%E5%91%A8%E7%8E%87%E7%9A%84%E5%85%AC%E5%BC%8F%E5%88%97%E8%A1%A8" title="含圆周率的公式列表">含圆周率的公式列表</a></li></ul></td> </tr><tr><th class="sidebar-heading" style="border-top:#aaa 1px solid;"> 證明</th></tr><tr><td class="sidebar-content"> <ul><li><a href="/wiki/%E8%AF%81%E6%98%8E%CF%80%E6%98%AF%E6%97%A0%E7%90%86%E6%95%B0" title="证明π是无理数">無理性</a></li> <li><a href="/w/index.php?title=%E6%9E%97%E5%BE%B7%E6%9B%BC%E2%80%94%E9%AD%8F%E7%88%BE%E6%96%AF%E7%89%B9%E6%8B%89%E6%96%AF%E5%AE%9A%E7%90%86&action=edit&redlink=1" class="new" title="林德曼—魏爾斯特拉斯定理（页面不存在）">超越性</a></li></ul></td> </tr><tr><th class="sidebar-heading" style="border-top:#aaa 1px solid;"> 值</th></tr><tr><td class="sidebar-content"> <ul><li><a href="/wiki/%E7%BA%A6%E7%8E%87" title="约率">約率</a>（<a href="/wiki/%E8%AD%89%E6%98%8E22/7%E5%A4%A7%E6%96%BC%CF%80" title="證明22/7大於π">證明22/7大於π</a>）</li> <li><a href="/wiki/%E5%AF%86%E7%8E%87" title="密率">密率</a></li> <li><a href="/wiki/%E5%9C%86%E5%91%A8%E7%8E%87%E8%BF%91%E4%BC%BC%E5%80%BC" title="圆周率近似值">近似值</a></li> <li><a href="/wiki/%E5%89%B2%E5%9C%86%E6%9C%AF_(%E5%88%98%E5%BE%BD)" title="割圆术 (刘徽)">割圓術</a></li></ul></td> </tr><tr><th class="sidebar-heading" style="border-top:#aaa 1px solid;"> 人物</th></tr><tr><td class="sidebar-content"> <ul><li><a href="/wiki/%E9%98%BF%E5%9F%BA%E7%B1%B3%E5%BE%B7" title="阿基米德">阿基米德</a></li> <li><a href="/wiki/%E5%88%98%E5%BE%BD" title="刘徽">刘徽</a></li> <li><a href="/wiki/%E7%A5%96%E5%86%B2%E4%B9%8B" title="祖冲之">祖冲之</a></li> <li><span class="ilh-all" data-orig-title="玛达瓦" data-lang-code="en" data-lang-name="英语" data-foreign-title="Madhava of Sangamagrama"><span class="ilh-page"><a href="/w/index.php?title=%E7%8E%9B%E8%BE%BE%E7%93%A6&action=edit&redlink=1" class="new" title="玛达瓦（页面不存在）">玛达瓦</a></span><span class="noprint ilh-comment">（<span class="ilh-lang">英语</span><span class="ilh-colon">：</span><span class="ilh-link"><a href="https://en.wikipedia.org/wiki/Madhava_of_Sangamagrama" class="extiw" title="en:Madhava of Sangamagrama"><span lang="en" dir="auto">Madhava of Sangamagrama</span></a></span>）</span></span></li> <li><a href="/wiki/%E5%A8%81%E5%BB%89%C2%B7%E7%90%BC%E6%96%AF_(%E6%95%B0%E5%AD%A6%E5%AE%B6)" title="威廉·琼斯 (数学家)">威廉·琼斯</a></li> <li><a href="/wiki/%E7%B4%84%E7%BF%B0%C2%B7%E6%A2%85%E6%AC%BD" title="約翰·梅欽">約翰·梅欽</a></li> <li><a href="/wiki/%E7%BA%A6%E7%BF%B0%C2%B7%E4%BC%A6%E5%A5%87" title="约翰·伦奇">约翰·伦奇</a></li> <li><a href="/wiki/%E9%B2%81%E9%81%93%E5%A4%AB%C2%B7%E8%8C%83%E7%A7%91%E4%BC%8A%E4%BC%A6" title="鲁道夫·范科伊伦">鲁道夫·范科伊伦</a></li> <li><a href="/wiki/%E9%98%BF%E8%80%B6%E6%B3%A2%E5%A4%9A" title="阿耶波多">阿耶波多</a></li></ul></td> </tr><tr><th class="sidebar-heading" style="border-top:#aaa 1px solid;"> 歷史</th></tr><tr><td class="sidebar-content"> <ul><li><a href="/wiki/%E5%9C%93%E5%91%A8%E7%8E%87%E8%A8%88%E7%AE%97%E5%B9%B4%E8%A1%A8" title="圓周率計算年表">年表</a></li></ul></td> </tr><tr><th class="sidebar-heading" style="border-top:#aaa 1px solid;"> 文化</th></tr><tr><td class="sidebar-content"> <ul><li><a href="/wiki/%E5%9C%93%E5%91%A8%E7%8E%87%E6%97%A5" title="圓周率日">節日</a></li></ul></td> </tr><tr><th class="sidebar-heading" style="border-top:#aaa 1px solid;"> 相關主題</th></tr><tr><td class="sidebar-content"> <ul><li><a href="/wiki/%E5%8C%96%E5%9C%93%E7%82%BA%E6%96%B9" title="化圓為方">化圓為方</a></li> <li><a href="/wiki/%E5%B7%B4%E5%A1%9E%E5%B0%94%E9%97%AE%E9%A2%98" title="巴塞尔问题">巴塞爾問題</a></li> <li><a href="/wiki/%E5%9C%86%E5%91%A8%E7%8E%87%E4%B8%AD%E8%BF%9E%E7%BB%AD%E7%9A%84%E5%85%AD%E4%B8%AA9" title="圆周率中连续的六个9">连续的六个9</a></li></ul></td> </tr><tr><td class="sidebar-navbar" style="line-height:1.6"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r84265675"><style data-mw-deduplicate="TemplateStyles:r84244141">.mw-parser-output .navbar{display:inline;font-weight:normal}.mw-parser-output .navbar-collapse{float:left;text-align:left}.mw-parser-output .navbar-boxtext{word-spacing:0}.mw-parser-output .navbar ul{display:inline-block;white-space:nowrap;line-height:inherit}.mw-parser-output .navbar-brackets::before{margin-right:-0.125em;content:"[ "}.mw-parser-output .navbar-brackets::after{margin-left:-0.125em;content:" ]"}.mw-parser-output .navbar li{word-spacing:-0.125em}.mw-parser-output .navbar a>span,.mw-parser-output .navbar a>abbr{text-decoration:inherit}.mw-parser-output .navbar-mini abbr{font-variant:small-caps;border-bottom:none;text-decoration:none;cursor:inherit}.mw-parser-output .navbar-ct-full{font-size:110%;margin:0 8em}.mw-parser-output .navbar-ct-mini{font-size:110%;margin:0 5em}html.skin-theme-clientpref-night .mw-parser-output .navbar li a abbr{color:var(--color-base)!important}@media(prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .navbar li a abbr{color:var(--color-base)!important}}@media print{.mw-parser-output .navbar{display:none!important}}</style><div class="navbar plainlinks hlist navbar-mini"><ul><li class="nv-view"><a href="/wiki/Template:Pi_box" title="Template:Pi box"><abbr title="查看该模板">查</abbr></a></li><li class="nv-talk"><a href="/wiki/Template_talk:Pi_box" title="Template talk:Pi box"><abbr title="讨论该模板">论</abbr></a></li><li class="nv-edit"><a href="/wiki/Special:%E7%BC%96%E8%BE%91%E9%A1%B5%E9%9D%A2/Template:Pi_box" title="Special:编辑页面/Template:Pi box"><abbr title="编辑该模板">编</abbr></a></li></ul></div></td></tr></tbody></table> <p><b>圓周</b>是指<a href="/wiki/%E5%9C%93" class="mw-redirect" title="圓">圓</a>或類似形狀的<a href="/wiki/%E5%91%A8%E9%95%BF" title="周长">周長</a>。 </p><p>圓周和數學上重要的<a href="/wiki/%E6%95%B8%E5%AD%B8%E5%B8%B8%E6%95%B8" class="mw-redirect" title="數學常數">數學常數</a><a href="/wiki/Pi" class="mw-redirect" title="Pi">π</a>有關。若定義圓周為<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 C}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi>C</mi> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle C}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/4fc55753007cd3c18576f7933f6f089196732029" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.338ex; width:1.766ex; height:2.176ex;" alt="{\displaystyle C}"></span>，<a href="/wiki/%E5%8D%8A%E5%BE%91" class="mw-redirect" title="半徑">半徑</a>為<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>，<a href="/wiki/%E7%9B%B4%E5%BE%91" class="mw-redirect" title="直徑">直徑</a>為<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 d}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi>d</mi> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle d}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/e85ff03cbe0c7341af6b982e47e9f90d235c66ab" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.338ex; width:1.216ex; height:2.176ex;" alt="{\displaystyle d}"></span>，圓周長和直徑的比值即為<span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle \pi }"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi>π</mi> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle \pi }</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/9be4ba0bb8df3af72e90a0535fabcc17431e540a" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.338ex; width:1.332ex; height:1.676ex;" alt="{\displaystyle \pi }"></span><sup id="cite_ref-1" class="reference"><a href="#cite_note-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup>： </p> <dl><dd><span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle {C}=\pi {d}=2\pi r.}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mrow class="MJX-TeXAtom-ORD"> <mi>C</mi> </mrow> <mo>=</mo> <mi>π</mi> <mrow class="MJX-TeXAtom-ORD"> <mi>d</mi> </mrow> <mo>=</mo> <mn>2</mn> <mi>π</mi> <mi>r</mi> <mo>.</mo> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle {C}=\pi {d}=2\pi r.}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/7e2172b1c188f7735b873ee5c3b65f4824a6f56a" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.338ex; width:14.701ex; height:2.176ex;" alt="{\displaystyle {C}=\pi {d}=2\pi r.}"></span></dd></dl> <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 \pi }"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi>π</mi> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle \pi }</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/9be4ba0bb8df3af72e90a0535fabcc17431e540a" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.338ex; width:1.332ex; height:1.676ex;" alt="{\displaystyle \pi }"></span>的數值是3.14159 26535 89793 ... （參照<a rel="nofollow" class="external text" href="//oeis.org/A000796">A000796</a>）。 </p> <figure class="mw-halign-left" typeof="mw:File/Thumb"><a href="/wiki/File:Circle-withsegments.svg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/0/03/Circle-withsegments.svg/150px-Circle-withsegments.svg.png" decoding="async" width="150" height="150" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/0/03/Circle-withsegments.svg/225px-Circle-withsegments.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/0/03/Circle-withsegments.svg/300px-Circle-withsegments.svg.png 2x" data-file-width="726" data-file-height="726" /></a><figcaption><br /> 圖中黑色的為圓周（C），<br /> 淺藍色的是直徑（D），<br /> 紅色是半徑（R），<br /> 洋紅色的是圓心。<br /> 圓周= <span class="texhtml">π</span> × 直徑 = 2 × <span class="texhtml">π</span> × 半徑</figcaption></figure> <figure class="mw-halign-center" typeof="mw:File/Thumb"><a href="/wiki/File:2pi-unrolled.gif" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/6/67/2pi-unrolled.gif/400px-2pi-unrolled.gif" decoding="async" width="400" height="138" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/6/67/2pi-unrolled.gif/600px-2pi-unrolled.gif 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/6/67/2pi-unrolled.gif/800px-2pi-unrolled.gif 2x" data-file-width="870" data-file-height="300" /></a><figcaption>若圓的<a href="/wiki/%E5%8D%8A%E5%BE%91" class="mw-redirect" title="半徑">半徑</a>為1，其圓周為2<span class="texhtml">π</span></figcaption></figure> <figure class="mw-halign-center" typeof="mw:File/Thumb"><a href="/wiki/File:Pi-unrolled-720.gif" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/2/2a/Pi-unrolled-720.gif/400px-Pi-unrolled-720.gif" decoding="async" width="400" height="127" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/2/2a/Pi-unrolled-720.gif/600px-Pi-unrolled-720.gif 1.5x, //upload.wikimedia.org/wikipedia/commons/2/2a/Pi-unrolled-720.gif 2x" data-file-width="720" data-file-height="228" /></a><figcaption>若圓的<a href="/wiki/%E7%9B%B4%E5%BE%91" class="mw-redirect" title="直徑">直徑</a>為1，其圓周為<span class="texhtml">π</span></figcaption></figure> <p><a href="/wiki/%E6%95%B8%E5%AD%B8%E5%B8%B8%E6%95%B8" class="mw-redirect" title="數學常數">數學常數</a>π常用在數學、工程學及科學中。 </p><p>另一個和圓周有關的比例是圓周和半徑的比值<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 {\tfrac {C}{r}}=2\pi }"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="false" scriptlevel="0"> <mfrac> <mi>C</mi> <mi>r</mi> </mfrac> </mstyle> </mrow> <mo>=</mo> <mn>2</mn> <mi>π</mi> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle {\tfrac {C}{r}}=2\pi }</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/67d402772d46a796cfe669de9bb46a36332efd8b" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -1.005ex; width:7.678ex; height:3.509ex;" alt="{\displaystyle {\tfrac {C}{r}}=2\pi }"></span>，雖然沒有正式的名稱，但也常用在<a href="/wiki/%E5%BC%A7%E5%BA%A6" title="弧度">弧度</a>及<a href="/wiki/%E7%89%A9%E7%90%86%E5%B8%B8%E6%95%B8" title="物理常數">物理常數</a>等許多場合中。 </p> <meta property="mw:PageProp/toc" /> <div class="mw-heading mw-heading2"><h2 id="椭圓的周長"><span id=".E6.A4.AD.E5.9C.93.E7.9A.84.E5.91.A8.E9.95.B7"></span>椭圓的周長</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=%E5%9C%93%E5%91%A8&action=edit&section=1" title="编辑章节：椭圓的周長"><span>编辑</span></a><span class="mw-editsection-bracket">]</span></span></div> <p><a href="/wiki/%E6%A4%AD%E5%9C%86" title="椭圆">椭圓</a>也可以計算其圓周，但需要透過<a href="/wiki/%E6%A4%AD%E5%9C%86%E7%A7%AF%E5%88%86" title="椭圆积分">第二類完全橢圓積分</a>才能表示。 </p> <div class="mw-heading mw-heading2"><h2 id="图论中的周長"><span id=".E5.9B.BE.E8.AE.BA.E4.B8.AD.E7.9A.84.E5.91.A8.E9.95.B7"></span>图论中的周長</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=%E5%9C%93%E5%91%A8&action=edit&section=2" title="编辑章节：图论中的周長"><span>编辑</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>在<a href="/wiki/%E5%9B%BE%E8%AE%BA" title="图论">图论</a>中，一个<a href="/wiki/%E5%9B%BE_(%E6%95%B0%E5%AD%A6)" title="图 (数学)">图</a>的周長是指其中所含的最长的<a href="/wiki/%E7%92%B0_(%E5%9C%96%E8%AB%96)" title="環 (圖論)">环</a>。 </p> <div class="mw-heading mw-heading2"><h2 id="相關條目"><span id=".E7.9B.B8.E9.97.9C.E6.A2.9D.E7.9B.AE"></span>相關條目</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=%E5%9C%93%E5%91%A8&action=edit&section=3" title="编辑章节：相關條目"><span>编辑</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><a href="/wiki/%E5%BC%A7%E9%95%BF" title="弧长">弧长</a></li> <li><a href="/wiki/%E7%AD%89%E5%91%A8%E5%AE%9A%E7%90%86" title="等周定理">等周定理</a></li> <li><a href="/wiki/%E5%9C%93%E5%91%A8%E9%81%8B%E5%8B%95" title="圓周運動">圓周運動</a></li></ul> <div class="mw-heading mw-heading2"><h2 id="參考資料"><span id=".E5.8F.83.E8.80.83.E8.B3.87.E6.96.99"></span>參考資料</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=%E5%9C%93%E5%91%A8&action=edit&section=4" title="编辑章节：參考資料"><span>编辑</span></a><span class="mw-editsection-bracket">]</span></span></div> <div class="reflist" style="list-style-type: decimal;"> <ol class="references"> <li id="cite_note-1"><span class="mw-cite-backlink"><b><a href="#cite_ref-1">^</a></b></span> <span class="reference-text"><cite class="citation web"><a rel="nofollow" class="external text" href="http://web2.nmns.edu.tw/Web-Title/china/A-2-2_display.htm">圓周率概說</a>. <span class="reference-accessdate"> [<span class="nowrap">2017-06-25</span>]</span>. （原始内容<a rel="nofollow" class="external text" href="https://web.archive.org/web/20160809012951/http://web2.nmns.edu.tw/Web-Title/china/A-2-2_display.htm">存档</a>于2016-08-09）.</cite><span title="ctx_ver=Z39.88-2004&rfr_id=info%3Asid%2Fzh.wikipedia.org%3A%E5%9C%93%E5%91%A8&rft.btitle=%E5%9C%93%E5%91%A8%E7%8E%87%E6%A6%82%E8%AA%AA&rft.genre=unknown&rft_id=http%3A%2F%2Fweb2.nmns.edu.tw%2FWeb-Title%2Fchina%2FA-2-2_display.htm&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook" class="Z3988"><span style="display:none;"> </span></span></span> </li> </ol></div> <table class="metadata plainlinks stub" role="presentation" style="background:transparent"><tbody><tr class="noresize"><td><span typeof="mw:File"><a href="/wiki/File:E-to-the-i-pi.svg" class="mw-file-description"><img alt="小作品圖示" src="//upload.wikimedia.org/wikipedia/commons/thumb/3/35/E-to-the-i-pi.svg/34px-E-to-the-i-pi.svg.png" decoding="async" width="34" height="30" class="mw-file-element" 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