Dipyramids & Trapezohedra

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Hexagonal Dipyramid
Vertices:  8  (6[4] + 2[6])
Faces:12  (isosceles triangles)
Edges:18  (6 short + 12 long)
Symmetry:  6-fold Prismatic  (D6h)
Dihedral Angle:  acos(−3/5)    ≈126.869897646 degrees
Dual Solid:  Hexagonal Prism
(values below based on unit-edge-length Hexagonal Prism)
Short Edge (6):  2*sqrt(3)/3    ≈1.1547005383792515290
Long Edge (12):  4*sqrt(3)/3    ≈2.3094010767585030580
[4]-Vertex Radius (6):  2*sqrt(3)/3    ≈1.1547005383792515290
[6]-Vertex Radius (2):  2
Edge-scribed Radius:  1
Inscribed Radius:  2*sqrt(5)/5    ≈0.89442719099991587856
Volume:8*sqrt(3)/3    ≈4.6188021535170061161