Johnson Solids (Page 1)
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(J9)
Elongated Pentagonal Pyramid
Vertices:
11 (5[3] + 5[4] + 1[5])
Faces:
11 (5 equilateral triangles + 5 squares + 1 regular pentagon)
Edges:
20
Symmetry:
5-fold Pyramidal (C5v)
(values below based on edge length = 1)
Volume:
(5+sqrt(5)+6*sqrt(5*(5
+2*sqrt(5))))/24
≈2.0219802329847914934