Disphenoid
Tetrahedron whose faces are all congruent / From Wikipedia, the free encyclopedia
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In geometry, a disphenoid (from Greek sphenoeides 'wedgelike') is a tetrahedron whose four faces are congruent acute-angled triangles.[1] It can also be described as a tetrahedron in which every two edges that are opposite each other have equal lengths. Other names for the same shape are isotetrahedron,[2] sphenoid,[3] bisphenoid,[3] isosceles tetrahedron,[4] equifacial tetrahedron,[5] almost regular tetrahedron,[6] and tetramonohedron.[7]
All the solid angles and vertex figures of a disphenoid are the same, and the sum of the face angles at each vertex is equal to two right angles. However, a disphenoid is not a regular polyhedron, because, in general, its faces are not regular polygons, and its edges have three different lengths.