# Great ditrigonary icosidodecahedral antiprism

Great ditrigonary icosidodecahedral antiprism
Rank4
TypeUniform
Notation
Bowers style acronymGidtidap
Coxeter diagram
Elements
Cells40 tetrahedra, 12 pentagonal antiprisms, 2 great ditrigonary icosidodecahedra
Faces40+120 triangles, 24 pentagons
Edges60+120
Vertices40
Vertex figureRetrotriangular cupola, edge lengths (1+5)/2 (3 base edges), 1 (remaining edges)
Measures (edge length 1)
Circumradius${\displaystyle {\sqrt {\frac {5+{\sqrt {5}}}{8}}}\approx 0.95106}$
Hypervolume0
Dichoral anglesGidtid–3–tet: ${\displaystyle \arccos \left(-{\frac {\sqrt {7-3{\sqrt {5}}}}{4}}\right)\approx 97.76124^{\circ }}$
Tet–3–pap: ${\displaystyle \arccos \left({\frac {\sqrt {7-3{\sqrt {5}}}}{4}}\right)\approx 82.23876^{\circ }}$
Gidtid–5–pap: ${\displaystyle \arccos \left({\frac {3-{\sqrt {5}}}{2}}\right)\approx 67.54448^{\circ }}$
Height${\displaystyle {\sqrt {\frac {{\sqrt {5}}-1}{2}}}\approx 0.78615}$
Related polytopes
ArmySemi-uniform Dope
RegimentSidtidap
DualGreat triambic icosahedral antitegum
Abstract & topological properties
Euler characteristic–10
OrientableYes
Properties
SymmetryH3×A1, order 240
ConvexNo
NatureTame

The great ditrigonary icosidodecahedral antiprism or gidtidap, is a nonconvex uniform polychoron that consists of 2 great ditrigonary icosidodecahedra, 12 pentagonal antiprisms, and 40 tetrahedra. Each vertex joins 1 great ditrigonary icosidodecahedron, 3 pentagonal antiprisms, and 4 tetrahedra.

The pentagonal antiprism cells pass through the center of the polychoron, making it a hemipolychoron.

## Vertex coordinates

Its vertices are the same as those of its regiment colonel, the small ditrigonary icosidodecahedral antiprism.