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Elongated Triangular Dipyramid
canonical form
Vertices:
8 (2[3] + 6[4])
Faces:
9 (6 isosceles triangles + 3 squares)
Edges:
15 (6 short + 9 long)
Symmetry:
3-fold Prismatic (D3h)
Dual Solid:
Triangular Bifrustum
(values below based on edge-scribed radius = 1)
Short Edge (6):
7*sqrt(3)/12
≈1.0103629710818450879
Long Edge (9):
sqrt(3)
≈1.73205080756887729353
Edge-scribed Radius:
1
Volume:
19/8
≈2.375