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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 pentagonal rotunda ： ウィキペディア英語版 pentagonal rotunda In geometry, the pentagonal rotunda is one of the Johnson solids (''J''6). It can be seen as half an icosidodecahedron. ==Formulae== The following formulae for volume, surface area, circumradius and height can be used if all faces are regular, with edge length ''a'':〔Stephen Wolfram, "(Pentagonal Rotunda )" from Wolfram Alpha. Retrieved July 21, 2010.〕 $V=\backslash left(\backslash frac\backslash left(45+17\backslash sqrt\backslash right)\backslash right)a^3\backslash approx6.91776...a^3$ $A=\backslash left(\backslash frac\backslash left(5\backslash sqrt+\backslash sqrt\backslash right)\backslash right)a^2=\backslash left(\backslash frac\backslash sqrt\backslash right)\}\backslash right)\}\backslash right)a^2\backslash approx22.3472...a^2$ $R=\backslash left(\backslash frac\backslash left(1+\backslash sqrt\backslash right)\backslash right)a\backslash approx1.61803...a$ $H=\backslash left(\backslash sqrt\}\}\backslash right)a\backslash approx1.37638...a$ 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「pentagonal rotunda」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.