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Elongated pentagonal gyrocupolarotunda : ウィキペディア英語版 | Elongated pentagonal gyrocupolarotunda
In geometry, the elongated pentagonal gyrocupolarotunda is one of the Johnson solids (''J''41). As the name suggests, it can be constructed by elongating a pentagonal gyrocupolarotunda (''J''33) by inserting a decagonal prism between its halves. Rotating either the pentagonal cupola (''J''5) or the pentagonal rotunda (''J''6) through 36 degrees before inserting the prism yields an elongated pentagonal orthocupolarotunda (''J''40). ==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 gyrocupolarotunda )" from Wolfram Alpha. Retrieved July 25, 2010.〕 :
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