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・ Elorrio
・ Elongated caecilian
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・ Elongated pentagonal gyrobirotunda
・ Elongated pentagonal gyrocupolarotunda
・ Elongated pentagonal orthobicupola
Elongated pentagonal orthobirotunda
・ Elongated pentagonal orthocupolarotunda
・ Elongated pentagonal pyramid
・ Elongated pentagonal rotunda
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Elongated pentagonal orthobirotunda : ウィキペディア英語版
Elongated pentagonal orthobirotunda

In geometry, the elongated pentagonal orthobirotunda is one of the Johnson solids (''J''42). As the name suggests, it can be constructed by elongating a pentagonal orthobirotunda (''J''34) 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 the elongated pentagonal gyrobirotunda (''J''43).
==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 orthobirotunda )" from Wolfram Alpha. Retrieved July 26, 2010.〕
V=\frac(45+17\sqrt+15\sqrt+\sqrt)a^2\approx39.306...a^2

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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