# 十一边形

（重定向自正十一邊形

11

${\displaystyle \approx 9.365639906945a^{2}}$

147.27272727273°

## 正十一邊形

${\displaystyle A={\frac {11}{4}}a^{2}\cot {\frac {\pi }{11}}\simeq 9.36564\,a^{2}}$

## 相關形狀

### 十一角星

 {11/2} {11/3} {11/4} {11/5}

### 圖

K11完全圖經常會被以正十一邊形的圖形繪製來描述其36條連接邊。這個圖與十維正十一胞體同為11個頂點和55條邊。

 十維正十一胞體

## 參考文獻

1. ^ Haldeman, Cyrus B., Construction of the regular undecagon by a sextic curve, Discussions, American Mathematical Monthly, 1922, 29 (10), JSTOR 2299029.
2. Loomis, Elias, Elements of Plane and Spherical Trigonometry: With Their Applications to Mensuration, Surveying, and Navigation, Harper: 65, 1859.
3. ^ Brewer, Ebenezer Cobham, Errors of speech and of spelling, London: W. Tegg and co.: iv, 1877.
4. ^ McClain, Kay, Glencoe mathematics: applications and connections, Glencoe/McGraw-Hill: 357, 1998, ISBN 9780028330549.
5. ^ Kline, Morris, Mathematical Thought From Ancient to Modern Times 2, Oxford University Press: 753–754, 1990, ISBN 9780199840427.
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7. ^ Davis, Michael W., The Geometry and Topology of Coxeter Groups (PDF), 2007, ISBN 978-0-691-13138-2, Zbl 1142.20020