Medial inverted pentagonal hexecontahedron

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Medial inverted pentagonal hexecontahedron
TypeUniform dual
Coxeter diagramp5/3p5p ()
Faces60 irregular concave pentagons
Vertex figure60 triangles, 12 pentagons, 12 pentagrams
Measures (edge length 1)
Inradius≈ 0.55808
Dihedral angle≈ 108.09572°
Central density9
Number of external pieces60
Related polytopes
DualInverted snub dodecadodecahedron
ConjugateMedial pentagonal hexecontahedron
Convex coreNon-Catalan pentakis dodecahedron
Abstract & topological properties
Flag count600
Euler characteristic–6
SymmetryH3+, order 60

The medial inverted pentagonal hexecontahedron is a uniform dual polyhedron. It consists of 60 irregular pentagons, each with two short, one medium, and two long edges. Its dual is the inverted snub dodecadodecahedron.

If the pentagon faces have medium edge length 2, then the short edge length is , and the long edge length is , where is the largest (least negative) real root of the polynomial . ​​The pentagons have three interior angles of , one of , and one of , where is the golden ratio.

A dihedral angle can be given as .

The inradius R ≈ 0.55808 of the medial inverted pentagonal hexecontahedron with unit edge length is equal to the square root of a real root of .

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