Johnson Solids (Page 2)
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(J21)
Elongated Pentagonal Rotunda
Vertices:
30 (10[3] + {10 + 5 * 2}[4])
Faces:
27 ({5 * 2} equilateral triangles + {5 * 2} squares
+ {5 + 1} regular pentagons + 1 regular decagon)
Edges:
55
Symmetry:
5-fold Pyramidal (C5v)
(values below based on edge length = 1)
Volume:
(45+17*sqrt(5)+30*sqrt(5
+2*sqrt(5)))/12
≈14.611971811062835576