# Uniform Polyhedra

Steven Dutch, Natural and Applied Sciences, University
of Wisconsin - Green Bay

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Uniform polyhedra have regular polygon faces and identical vertices. The only convex
uniform polyhedra are the five Platonic solids and the 13 Archimedean solids. If we expand
the definition to allow interpenetrating faces, we obtain the four Kepler-Poinsot
polyhedra and 53 others, for a total of 75.

## Convex Uniform Polyhedra

### The Platonic Solids

### The Archimedean Solids

## Non-convex Uniform Polyhedra

### The Kepler-Poinsot Solids

### The Coxeter-Skilling Non-convex Uniform Polyhedra

Solids where faces pass through the center are sometimes called *hemihedra*. These
and some other polyhedra can be considered "one-sided" since both sides of some
faces are exposed at various times.

The solids above are derived from the rhombicuboctahedron and rhombicosidodecahedron by
*faceting*, or removing parts of the solid bounded by planes within the solid.

The solids above are derived by faceting the cube and dodecahedron to produce 8/3 and
10/3 faces.

The two solids above have the same vertices and edges as the preceding two pairs, but
the 8/3 and 10/3 faces have been faceted to result in intricate rosettes.

The three solids above result from faceting the square faces of a
rhombicosidodecahedron

Faceting a dodecahedron results in a family of star-faced polyhedra

The solids above are derived by truncating the great dodecahedron, great icosahedron
and great stellated dodecahedron

#### Snubs

## References

- Coxeter, H.S.M, Longuet-Higgins, M.S. and Miller, J.C.P., 1953,
*Uniform Polyhedra*,
Philosophical Transactions of the Royal Society of London, v. A246, pp. 401-440.
- Wenninger, M. J., 1971,
*Polyhedron Models*, Cambridge University Press
- Skilling, J., 1975,
*The Complete Set of Uniform Polyhedra*, Philosophical
Transactions of the Royal Society of London, v. A278, pp. 111-135.

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*Created 8 Oct. 1997, Last Update 2 March 1999*

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