Theorem on the Dihedral Angles of an Isosceles Tetrahedron @wolframmathematica
Theorem on the Dihedral Angles of an Isosceles Tetrahedron @wolframmathematica
Uploaded June 2017 | Updated September 2026, 2 weeks ago
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Let the edge lengths of an isosceles tetrahedron T be a, b, c, d=c, e=a and f=b. This Demonstration shows that the sum of the cosines of the dihedral angles in T equals 2. This is not true for a general tetrahedron, in which opposite sides need not be e...

Contributed by: Izidor Hafner

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Theorem on the Dihedral Angles of an Isosceles Tetrahedron

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