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Elongated pentagonal cupola : ウィキペディア英語版
Elongated pentagonal cupola

In geometry, the elongated pentagonal cupola is one of the Johnson solids (''J''20). As the name suggests, it can be constructed by elongating a pentagonal cupola (''J''5) by attaching a decagonal prism to its base. The solid can also be seen as an elongated pentagonal orthobicupola (''J''38) with its "lid" (another pentagonal cupola) removed.
==Formulas==
The following formulas for the volume and surface area can be used if all faces are regular, with edge length ''a'':〔Stephen Wolfram, "(Elongated pentagonal cupola )" from Wolfram Alpha. Retrieved July 22, 2010.〕
V=(\frac(5+4\sqrt+15\sqrt(60+\sqrt})}))a^2\approx26.5797...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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