Johnson Solids (Page 1)

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(J16) Elongated Pentagonal Dipyramid regular faces

Vertices:   12  (10[4] + 2[5]) Faces: 15  (10 equilateral triangles + 5 squares) Edges: 25 Symmetry:   5-fold Prismatic  (D5h) (values below based on edge length = 1) Volume: (5+sqrt(5)+3*sqrt(5*(5         +2*sqrt(5))))/12     ≈2.3234830653806160641