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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 elongated pentagonal gyrobirotunda ： ウィキペディア英語版 elongated pentagonal gyrobirotunda In geometry, the elongated pentagonal gyrobirotunda is one of the Johnson solids (''J''43). As the name suggests, it can be constructed by elongating a "pentagonal gyrobirotunda," or icosidodecahedron (one of the Archimedean solids), by inserting a decagonal prism between its congruent halves. Rotating one of the pentagonal rotundae (''J''6) through 36 degrees before inserting the prism yields an elongated pentagonal orthobirotunda (''J''42). ==Formulae== The following formulae for volume and surface area can be used if all faces are regular, with edge length ''a'':〔Stephen Wolfram, "(Elongated pentagonal gyrobirotunda )" from Wolfram Alpha. Retrieved July 26, 2010.〕 $V=\backslash frac(45+17\backslash sqrt+15\backslash sqrt+\backslash sqrt)a^2\; \backslash approx\; 39.306...a^2$ 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「elongated pentagonal gyrobirotunda」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.