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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.〕
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