In geometry, the Pentagonal orthobirotunda is one of the Johnson solids (J₃₄). It can be constructed by joining two pentagonal rotundas on their decagonal faces, but not in the standard orientation that gives the icosidodecahedron. In comparison, the halves are twisted 36 degrees relative to each other, giving an "equator" on which triangle meets triangle and pentagon meets pentagon.

The 92 Johnson solids were named and described by Norman Johnson in 1966.

External links

• Johnson Solid -- from MathWorld