# Properties of Isosceles Tetrahedra

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An isosceles tetrahedron is a nonregular tetrahedron in which each pair of opposite polyhedron edges are equal; that is, , , . Then all the triangular faces are congruent, so that an isosceles tetrahedron can be classified as an isohedron. An isosceles tetrahedron is also called a disphenoid.

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Contributed by: Izidor Hafner (April 2017)

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