Johnson Solids (Page 1)
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(J11)
Gyroelongated Pentagonal Pyramid
Vertices:
11 (5[4] + {5 + 1}[5])
Faces:
16 ({5 * 3} equilateral triangles + 1 regular pentagon)
Edges:
25
Symmetry:
5-fold Pyramidal (C5v)
(values below based on edge length = 1)
Volume:
(25+9*sqrt(5))/24
≈1.8801921582290878028