A hexadecahedron (or hexakaidecahedron) is a

polyhedron In geometry, a polyhedron (plural polyhedra or polyhedrons; ) is a three-dimensional shape with flat polygonal faces, straight edges and sharp corners or vertices. A convex polyhedron is the convex hull of finitely many points, not all on ...

with 16 faces. No hexadecahedron is

regular The term regular can mean normal or in accordance with rules. It may refer to: People * Moses Regular (born 1971), America football player Arts, entertainment, and media Music * "Regular" (Badfinger song) * Regular tunings of stringed instrum ...

; hence, the name is ambiguous. There are numerous topologically distinct forms of a hexadecahedron, for example the pentadecagonal pyramid, tetradecagonal prism and heptagonal antiprism.

Convex hexadecahedra

There are 387,591,510,244 topologically distinct ''convex'' hexadecahedra, excluding mirror images, having at least 10 vertices. (Two polyhedra are "topologically distinct" if they have intrinsically different arrangements of faces and vertices, such that it is impossible to distort one into the other simply by changing the lengths of edges or the angles between edges or faces.)

Self-dual hexadecahedra

There are 302,404 self-dual hexadecahedron, 1476 with at least order 2 symmetry.Symmetries of Canonical Self-Dual Polyhedra
/ref> The high symmetry self-dual has chiral

tetrahedral symmetry 150px, A regular tetrahedron, an example of a solid with full tetrahedral symmetry A regular tetrahedron has 12 rotational (or orientation-preserving) symmetries, and a symmetry order of 24 including transformations that combine a reflection ...

, and can be seen topologically by removing 4 of 20 vertices of a regular

dodecahedron In geometry, a dodecahedron (Greek , from ''dōdeka'' "twelve" + ''hédra'' "base", "seat" or "face") or duodecahedron is any polyhedron with twelve flat faces. The most familiar dodecahedron is the regular dodecahedron with regular pentag ...

and is called a

tetrahedrally diminished dodecahedron In geometry, a tetrahedrally diminished dodecahedron (also tetrahedrally stellated icosahedron or propello tetrahedron) is a topologically self-dual polyhedron made of 16 vertices, 30 edges, and 16 faces (4 equilateral triangles and 12 identical ...

Examples

The following list gives examples of hexadecahedra. * Heptagonal antiprism * Gyroelongated pentagonal pyramid * Gyroelongated square bipyramid *

Augmented dodecahedron In geometry, the augmented dodecahedron is one of the Johnson solids (), consisting of a dodecahedron In geometry, a dodecahedron (Greek , from ''dōdeka'' "twelve" + ''hédra'' "base", "seat" or "face") or duodecahedron is any polyhedron ...

* Truncated triakis tetrahedron

References

What Are Polyhedra?
with Greek Numerical Prefixes

External links

Polyhedra {{polyhedron-stub