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pentagonal gyrocupolarotunda : ウィキペディア英語版 | pentagonal gyrocupolarotunda
In geometry, the pentagonal gyrocupolarotunda is one of the Johnson solids (''J''33). Like the pentagonal orthocupolarotunda (''J''32), it can be constructed by joining a pentagonal cupola (''J''5) and a pentagonal rotunda (''J''6) along their decagonal bases. The difference is that in this solid, the two halves are rotated 36 degrees with respect to one another. ==Formulae== The following formulae for volume and surface area can be used if all faces are regular, with edge length ''a'':〔Stephen Wolfram, "(Pentagonal gyrocupolarotunda )" from Wolfram Alpha. Retrieved July 24, 2010.〕
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