Johnson Solids (Page 1)
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(J6)
Pentagonal Rotunda
Vertices:
20 (10[3] + {5 * 2}[4])
Faces:
17 ({5 * 2} equilateral triangles + {5 + 1} regular pentagons
+ 1 regular decagon)
Edges:
35
Symmetry:
5-fold Pyramidal (C5v)
(values below based on edge length = 1)
Volume:
(45+17*sqrt(5))/12
≈6.9177629681247020699