Fig. 457.40 Definition of Spherical Polyhedra in 31GreatCircle
Icosahedron System: The 31 great circles
of the spherical icosahedron provide spherical edges
for three other polyhedra in addition to the
icosahedron itself, whose edges are shown as heavy lines.
The shading indicates a typical face, as follows:
 The rhombic triacontahedron with 30 spherical rhombic
faces, each consisting of four basic, least
commondenominator triangles.
 The octahedron with 15 basic, leastcommondenominator
spherical triangles.
 The pentagonal dodecahedron with ten basic, leastcommondenominator
spherical triangles.
 Skewed spherical vector equilibrium.
