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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Tetracontaoctagon ： ウィキペディア英語版 Tetracontaoctagon In geometry, a tetracontaoctagon (or tetracontakaioctagon) is a forty-eight-sided polygon or 48-gon. The sum of any tetracontaoctagon's interior angles is 8280 degrees. ==Regular tetracontaoctagon== The ''regular tetracontaoctagon'' is represented by Schläfli symbol and can also be constructed as a truncated icositetragon, t, or a twice-truncated dodecagon, tt, or a thrice-truncated hexagon, ttt, or a fourfold-truncated triangle, tttt. One interior angle in a regular tetracontaoctagon is 172.5°, meaning that one exterior angle would be 7.5°. The area of a regular tetracontaoctagon is: (with ''t'' = edge length) : $A\; =\; 12t^2\; \backslash cot\; \backslash frac.$ The tetracontaoctagon appeared in Archimedes' polygon approximation of pi, along with the hexagon (6-gon), dodecagon (12-gon), icositetragon (24-gon), and enneacontahexagon (96-gon). 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Tetracontaoctagon」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.