vertices | 20 edges | 60 faces | 30 (30 quadrilaterals)
1 (60 edges)
30
sqrt(3)/2≈0.866025
1/sqrt(2)≈0.707107
(assuming unit edge length)
20 edge-transitive graph 20
five octahedra
icosahedral group
amphichiral | compound | concave | equilateral | rigid
