Johnson Solids (Page 1)
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(J17)
Gyroelongated Square Dipyramid
Vertices:
10 (2[4] + 8[5])
Faces:
16 ({8 * 2} equilateral triangles)
Edges:
24
Symmetry:
4-fold Antiprismatic (D4v)
(values below based on edge length = 1)
Volume:
(sqrt(2)+sqrt(4+3*sqrt(2)))/3
≈1.42840450262774840053