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・ Octagrammic crossed-antiprism
・ Octagrammic cupola
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Octahedron
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Octahedron : ウィキペディア英語版
Octahedron

In geometry, an octahedron (plural: octahedra) is a polyhedron with eight faces. A regular octahedron is a Platonic solid composed of eight equilateral triangles, four of which meet at each vertex.
A regular octahedron is the dual polyhedron of a cube. It is a rectified tetrahedron. It is a square bipyramid in any of three orthogonal orientations. It is also a triangular antiprism in any of four orientations.
An octahedron is the three-dimensional case of the more general concept of a cross polytope.
A regular octahedron is a 3-ball in the Manhattan (\ell_1) metric.
==Regular octahedron==


抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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