Icosahedral pyramid

Icosahedral pyramid

Schlegel diagram
Type Polyhedral pyramid
Schläfli symbol ( ) ∨ {3,5}
Cells 21 1 {3,5}
20 ( ) ∨ {3}
Faces 50 20+30 {3}
Edges 12+30
Vertices 13
Dual Dodecahedral pyramid
Symmetry group H3, [5,3,1], order 120
Properties convex, regular-faces

The icosahedral pyramid is a four-dimensional convex polytope, bounded by one icosahedron as its base and by 20 triangular pyramid cells which meet at its apex. Since an icosahedron has a circumradius divided by edge length less than one,[1] the tetrahedral pyramids can be made with regular faces.

The regular 600-cell has icosahedral pyramids around every vertex.

The dual to the icosahedral pyramid is the dodecahedral pyramid, seen as a dodecahedral base, and 20 regular pentagonal pyramids meeting at an apex.

References

  1. Klitzing, Richard. "3D convex uniform polyhedra x3o5o - ike"., circumradius sqrt[(5+sqrt(5))/8 = 0.951057
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