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Great rhombihexahedron

Polyhedron with 18 faces From Wikipedia, the free encyclopedia

Great rhombihexahedron
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In geometry, the great rhombihexahedron (or great rhombicube) is a nonconvex uniform polyhedron, indexed as U21. It has 18 faces (12 squares and 6 octagrams), 48 edges, and 24 vertices.[1] Its dual is the great rhombihexacron.[2] Its vertex figure is a crossed quadrilateral.

Great rhombihexahedron
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TypeUniform star polyhedron
ElementsF = 18, E = 48
V = 24 (χ = 6)
Faces by sides12{4}+6{8/3}
Coxeter diagram (with extra double-covered triangles)
(with extra double-covered squares)
Wythoff symbol2 4/3 (3/2 4/2) |
Symmetry groupOh, [4,3], *432
Index referencesU21, C82, W103
Dual polyhedronGreat rhombihexacron
Vertex figureThumb
4.8/3.4/3.8/5
Bowers acronymGroh
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3D model of a great rhombihexahedron
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Orthogonal projections

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Traditional filling
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Modulo-2 filling
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It shares the vertex arrangement with the convex truncated cube. It additionally shares its edge arrangement with the nonconvex great rhombicuboctahedron (having 12 square faces in common), and with the great cubicuboctahedron (having the octagrammic faces in common).

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Truncated cube
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Nonconvex great rhombicuboctahedron
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Great cubicuboctahedron
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Great rhombihexahedron

It may be constructed as the exclusive or (blend) of three octagrammic prisms. Similarly, the small rhombihexahedron may be constructed as the exclusive or of three octagonal prisms.

Great rhombihexacron

Great rhombihexacron
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TypeStar polyhedron
FaceThumb
ElementsF = 24, E = 48
V = 18 (χ = 6)
Symmetry groupOh, [4,3], *432
Index referencesDU21
dual polyhedronGreat rhombihexahedron
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3D model of a great rhombihexacron

The great rhombihexacron is a nonconvex isohedral polyhedron. It is the dual of the uniform great rhombihexahedron (U21).[3] It has 24 identical bow-tie-shaped faces, 18 vertices, and 48 edges.

It has 12 outer vertices which have the same vertex arrangement as the cuboctahedron, and 6 inner vertices with the vertex arrangement of an octahedron.

As a surface geometry, it can be seen as visually similar to a Catalan solid, the disdyakis dodecahedron, with much taller rhombus-based pyramids joined to each face of a rhombic dodecahedron.

See also

References

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