Pentagonal orthobirotunda
- Pentagonal orthobirotunda
Infobox Polyhedron
Polyhedron_Type=Johnson
"J"33 - J34 - J35
Face_List=2.10 triangles
2+10 pentagons
Edge_Count=60
Vertex_Count=32
Symmetry_Group="D"5h|
Vertex_List=10(32.52)
2.10(3.5.3.5)
Dual=-
Property_List=convex
In geometry, the pentagonal orthobirotunda is one of the Johnson solids ("J"34). As the name suggests, it can be constructed by joining two pentagonal rotundae ("J"6) along their decagonal faces, matching like faces. A 36-degree rotation of one rotunda before the joining, so that pentagons abut triangles and vice versa, yields an icosidodecahedron, one of the Archimedean solids.
The 92 Johnson solids were named and described by Norman Johnson in 1966.
External links
* [http://mathworld.wolfram.com/JohnsonSolid.html Johnson Solid -- from MathWorld]
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