Johnson Solids (Page 1)

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(J10) Gyroelongated Square Pyramid

Vertices:   9  ({4 + 1}[4] + 4[5]) Faces: 13  ({4 * 3} equilateral triangles + 1 square) Edges: 20 Symmetry:   4-fold Pyramidal  (C4v) (values below based on edge length = 1) Volume: (sqrt(2)+2*sqrt(4+3*sqrt(2)))/6     ≈1.1927022422322325591