Parabigyrate rhombicosidodecahedron

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Parabigyrate rhombicosidodecahedron
Parabigyrate rhombicosidodecahedron.png
Type Johnson
J72 - J73 - J74
Faces 2x10 triangles
3x10 squares
2+10 pentagons
Edges 120
Vertices 60
Vertex configuration 20(3.42.5)
2x10+20(3.4.5.4)
Symmetry group D5d
Dual polyhedron -
Properties convex
Net
Johnson solid 73 net.png

In geometry, the parabigyrate rhombicosidodecahedron is one of the Johnson solids (J73). It can be constructed as a rhombicosidodecahedron with two opposing pentagonal cupolae rotated through 36 degrees.

A Johnson solid is one of 92 strictly convex polyhedra that have regular faces but are not uniform (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]

Alternative Johnson solids, constructed by rotating different cupolae of a rhombicosidodecahedron, are: the gyrate rhombicosidodecahedron (J72) where only one cupola is rotated, the metabigyrate rhombicosidodecahedron (J74) where two non-opposing cupolae are rotated and the trigyrate rhombicosidodecahedron (J75) where three cupolae are rotated.

External links[edit]

  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 .