Pentagonal orthobirotunda

In geometry, the pentagonal orthobirotunda is one of the Johnson solids (J34). It can be constructed by joining two pentagonal rotundae (J6) along their decagonal faces, matching like faces.

Pentagonal orthobirotunda
TypeJohnson
J33 - J34 - J35
Faces2x10 triangles
2+10 pentagons
Edges60
Vertices30
Vertex configuration10(32.52)
2.10(3.5.3.5)
Symmetry groupD5h
Dual polyhedronTrapezo-rhombic triacontahedron
Propertiesconvex
Net

A Johnson solid is one of 92 strictly convex polyhedra that is composed of regular polygon faces but are not uniform polyhedra (that is, they are not Platonic solids, Archimedean solids, prisms, or antiprisms). They were named by Norman Johnson, who first listed these polyhedra in 1966.[1]

The pentagonal orthobirotunda is also related to an Archimedean solid, the icosidodecahedron, which can also be called a pentagonal gyrobirotunda, similarly created by two pentagonal rotunda but with a 36-degree rotation.


(Dissection)

Icosidodecahedron
(pentagonal gyrobirotunda)

Pentagonal orthobirotunda

Pentagonal rotunda


  1. Johnson, Norman W. (1966), "Convex polyhedra with regular faces", Canadian Journal of Mathematics, 18: 169–200, doi:10.4153/cjm-1966-021-8, MR 0185507, Zbl 0132.14603.
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