Johnson Solids (Page 1)
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(J12)
Triangular Dipyramid
regular faces
Vertices:
5 (2[3] + 3[4])
Faces:
6 (6 equilateral triangles)
Edges:
9
Symmetry:
3-fold Prismatic (D3h)
(values below based on edge length = 1)
Inscribed Radius:
sqrt(6)/9
≈0.27216552697590867758
Volume:
sqrt(2)/6
≈0.23570226039551584147