Johnson Solids (Page 1)
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(J13)
Pentagonal Dipyramid
regular faces
Vertices:
7 (5[4] + 2[5])
Faces:
10 (10 equilateral triangles)
Edges:
15
Symmetry:
5-fold Prismatic (D5h)
(values below based on edge length = 1)
Inscribed Radius:
(5*sqrt(3)+sqrt(15))/30
≈0.41777457946839344509
Volume:
(5+sqrt(5))/12
≈0.60300566479164914137