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Icosahedral bipyramid

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4-D polytope; direct sum of an icosahedron and a segment
Icosahedral bipyramid
Orthogonal projection:   Base icosahedron edges (30)   Base icosahedron vertices (12)   Apex vertices (2)   Connecting edges (24)
TypePolyhedral bipyramid
Schläfli symbol{3,5} + { }
dt{2,5,3}
Coxeter diagram
Cells40 {3,3}
Faces80 {3}
Edges54 (30+12+12)
Vertices14 (12+2)
Symmetry group, order 240
Propertiesconvex, regular-celled, Blind polytope

In 4-dimensional geometry, the icosahedral bipyramid is the direct sum of an icosahedron and a segment, {3,5} + { }. Each face of a central icosahedron is attached with two tetrahedra, creating 40 tetrahedral cells, 80 triangular faces, 54 edges, and 14 vertices. An icosahedral bipyramid can be seen as two icosahedral pyramids augmented together at their bases.

It is the dual of a dodecahedral prism, Coxeter-Dynkin diagram , so the bipyramid can be described as . Both have Coxeter notation symmetry , order 240.

Having all regular cells (tetrahedra), it is a Blind polytope.

See also

References

  1. "Ite".

External links


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