Elongated pentagonal rotunda
- Elongated pentagonal rotunda
Infobox_Polyhedron
Polyhedron_Type=Johnson
"J"20 - J21 - J22
Face_List=2.5 triangles
2.5 squares
1+5 pentagons
1 decagon
Edge_Count=55
Vertex_Count=30
Symmetry_Group="C"5v|
Vertex_List=10(42.10)
10(3.42.5)
2.5(3.5.3.5)
Dual=-
Property_List=convex
In geometry, the elongated pentagonal rotunda is one of the Johnson solids ("J"21). As the name suggests, it can be constructed by elongating a pentagonal rotunda ("J"6) by attaching a decagonal prism to its base. It can also be seen as an elongated pentagonal orthobirotunda ("J"42) with one pentagonal rotunda removed.
The 92 Johnson solids were named and described by Norman Johnson in 1966.
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Elongated pentagonal gyrobirotunda — Infobox Polyhedron Polyhedron Type=Johnson J42 J43 J44 Face List=2310 triangles 10 squares 2+10 pentagons Edge Count=80 Vertex Count=40 Symmetry Group= D 5d Vertex List=20(3.42.5) 2.10(3.5.3.5) Dual= Property List=convexIn geometry, the elongated … Wikipedia
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