Elongated pentagonal gyrobicupola

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In geometry, the elongated pentagonal gyrobicupola is one of the Johnson solids (J39Script error: No such module "Check for unknown parameters".). As the name suggests, it can be constructed by elongating a pentagonal gyrobicupola (J31Script error: No such module "Check for unknown parameters".) by inserting a decagonal prism between its congruent halves. Rotating one of the pentagonal cupolae (J5Script error: No such module "Check for unknown parameters".) through 36 degrees before inserting the prism yields an elongated pentagonal orthobicupola (J38Script error: No such module "Check for unknown parameters".).

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File:J39 elongated pentagonal gyrobicupola.stl
3D model of an elongated pentagonal gyrobicupola

Formulae

The following formulae for volume and surface area can be used if all faces are regular, with edge length a:[1]

V=16(10+85+155+25)a312.3423...a3
A=(20+52(10+5+75+305))a227.7711...a2

References

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External links

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