 Disdyakis Dodecahedron
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Disdyakis Dodecahedron
Disdyakis dodecahedron (rotating and 3D model)
Type Catalan solid
Conway notation mC
Coxeter diagram     Face polygon scalene triangle
Faces 48
Edges 72
Vertices 26 = 6 + 8 + 12
Face configuration V4.6.8
Symmetry group Oh, B3, [4,3], *432
Dihedral angle 155° 4' 56"
$\arccos(-{\frac {71+12{\sqrt {2}}}{97}})$ Dual polyhedron truncated cuboctahedron
Properties convex, face-transitive net

In geometry, a disdyakis dodecahedron, (also hexoctahedron,hexakis octahedron, octakis cube, octakis hexahedron, kisrhombic dodecahedron), is a Catalan solid with 48 faces and the dual to the Archimedean truncated cuboctahedron. As such it is face-transitive but with irregular face polygons. It resembles an augmented rhombic dodecahedron. Replacing each face of the rhombic dodecahedron with a flat pyramid creates a polyhedron that looks almost like the disdyakis dodecahedron, and is topologically equivalent to it. More formally, the disdyakis dodecahedron is the Kleetope of the rhombic dodecahedron. The net of the rhombic dodecahedral pyramid also shares the same topology.

## Symmetry

It has Ohoctahedral symmetry. Its collective edges represent the reflection planes of the symmetry. It can also be seen in the corner and mid-edge triangulation of the regular cube and octahedron, and rhombic dodecahedron. Disdyakisdodecahedron Deltoidalicositetrahedron Rhombicdodecahedron Hexahedron Octahedron

The edges of a spherical disdyakis dodecahedron belong to 9 great circles. Three of them form a spherical octahedron (gray in the images below). The remaining six form three square hosohedra (red, green and blue in the images below). They all correspond to mirror planes - the former in dihedral [2,2], and the latter in tetrahedral [3,3] symmetry.

## Dimensions

If its smallest edges have length a, its surface area and volume are

{\begin{aligned}A&={\tfrac {6}{7}}{\sqrt {783+436{\sqrt {2}}}}\,a^{2}\\V&={\tfrac {1}{7}}{\sqrt {3\left(2194+1513{\sqrt {2}}\right)}}a^{3}\end{aligned}} The faces are scalene triangles. Their angles are $\arccos({\frac {1}{6}}-{\frac {1}{12}}{\sqrt {2}})\approx 87.201\,963\,767\,96^{\circ }$ , $\arccos({\frac {3}{4}}-{\frac {1}{8}}{\sqrt {2}})\approx 55.024\,696\,148\,90^{\circ }$ and $\arccos({\frac {1}{12}}+{\frac {1}{2}}{\sqrt {2}})\approx 37.773\,340\,083\,13^{\circ }$ .

## Orthogonal projections

The truncated cuboctahedron and its dual, the disdyakis dodecahedron can be drawn in a number of symmetric orthogonal projective orientations. Between a polyhedron and its dual, vertices and faces are swapped in positions, and edges are perpendicular.

 Projectivesymmetry Image Dualimage       +              ## Related polyhedra and tilings  Polyhedra similar to the disdyakis dodecahedron are duals to the Bowtie octahedron and cube, containing extra pairs triangular faces .

The disdyakis dodecahedron is one of a family of duals to the uniform polyhedra related to the cube and regular octahedron.

It is a polyhedra in a sequence defined by the face configuration V4.6.2n. This group is special for having all even number of edges per vertex and form bisecting planes through the polyhedra and infinite lines in the plane, and continuing into the hyperbolic plane for any n >= 7.

With an even number of faces at every vertex, these polyhedra and tilings can be shown by alternating two colors so all adjacent faces have different colors.

Each face on these domains also corresponds to the fundamental domain of a symmetry group with order 2,3,n mirrors at each triangle face vertex.