Self-Intersecting Quasi-Regular Polyhedra

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(Uniform #41) Ditrigonal Dodecadodecahedron
Vertices:  20  (20[6])
Faces:24  (12 regular pentagons + 12 regular pentagrams)
Edges:60
Symmetry:  Full Icosahedral  (Ih)
Dihedral Angle:  acos(sqrt(5)/5)    ≈63.434948823 degrees
Dual Solid:  Medial Triambic Icosahedron
(values below based on edge length = 1)
Circumscribed Radius:  sqrt(3)/2    ≈0.86602540378443864676
Midscribed Radius:  sqrt(2)/2    ≈0.70710678118654752440
Pentagon Center Radius:  −sqrt(5*(5−2*sqrt(5)))/10    ≈−0.16245984811645316308
Pentagram Center Radius:  sqrt(5*(5+2*sqrt(5)))/10    ≈0.68819096023558676910


References:[1]Jean Paul Albert Badoureau, Mémoire sur les Figures Isocèles,
Journal de l'École polytechnique 49 (1881), 47-172.