Dipyramids & Trapezohedra

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(Uniform #6) Trigonal Trapezohedron (Cube)
Vertices:  8  (8[3])
Faces:6  (squares)
Edges:12
Symmetry:  Full Octahedral  (Oh)
Dihedral Angle:  acos(0)    90 degrees
Dual Solid:  Triangular Antiprism (Octahedron)
(values below based on unit-edge-length Triangular Antiprism)
Edge Length:  sqrt(2)/2    ≈0.70710678118654752440
Circumscribed Radius:  sqrt(6)/4    ≈0.612372435695794524549
Midscribed Radius:  1/2    0.5
Inscribed Radius:  sqrt(2)/4    ≈0.35355339059327376220
Volume:sqrt(2)/4    ≈0.35355339059327376220