Johnson Solids (Page 1)
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(J19)
Elongated Square Cupola
Vertices:
20 (8[3] + {8 + 4}[4])
Faces:
18 (4 equilateral triangles + {4 * 3 + 1} squares
+ 1 regular octagon)
Edges:
36
Symmetry:
4-fold Pyramidal (C4v)
(values below based on edge length = 1)
Volume:
(9+8*sqrt(2))/3
≈6.77123616632825346347