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hexahedron
A hexahedron (plural: hexahedra) is any polyhedron with six faces. A cube, for example, is a regular hexahedron with all its faces square, and three squares around each vertex.
There are seven topologically distinct ''convex'' hexahedra,〔(Counting polyhedra )〕 one of which exists in two mirror image forms. (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.)
There are three further topologically distinct hexahedra that can only be realised as ''concave'' figures:
==References==
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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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