Johnson Solids (Page 2)
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(J31)
Pentagonal Gyrobicupola
Vertices:
20 ({10 * 2}[4])
Faces:
22 (10 equilateral triangles + 10 squares + 2 regular pentagons)
Edges:
40
Symmetry:
5-fold Antiprismatic (D5v)
(values below based on edge length = 1)
Volume:
(5+4*sqrt(5))/3
≈4.6480906366663862619