Johnson Solids (Page 5)
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(J88)
Sphenomegacorona
Vertices:
12 ({2 * 2}[4] + {4 + 2 * 2}[5])
Faces:
18 ({4 * 3 + 2 * 2} equilateral triangles + 2 squares)
Edges:
28
Symmetry:
2-fold Pyramidal (C2v)
(values below based on edge length = 1)
Volume:
sqrt(root[16th-order polynomial])
≈1.9481082288594728033