Elongated pentagonal rotunda
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In geometry, the elongated pentagonal rotunda is one of the Johnson solids (J21). As the name suggests, it can be constructed by elongating a pentagonal rotunda (J6) by attaching a decagonal prism to its base. It can also be seen as an elongated pentagonal orthobirotunda (J42) with one pentagonal rotunda removed.
Quick Facts Type, Faces ...
Elongated pentagonal rotunda | |
---|---|
Type | Johnson J20 - J21 - J22 |
Faces | 2x5 triangles 2x5 squares 1+5 pentagons 1 decagon |
Edges | 55 |
Vertices | 30 |
Vertex configuration | 10(42.10) 10(3.42.5) 2.5(3.5.3.5) |
Symmetry group | C5v |
Dual polyhedron | - |
Properties | convex |
Net | |
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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]