Fig. 457.30A Axes of Rotation of Icosahedron:
- The rotation of the icosahedron on axes through midpoints
of opposite edges define 15 great-circle
planes.
- The rotation of the icosahedron on axes through opposite
vertexes define six equatorial great-circle
planes, none of which pass through any vertexes.
- The rotation of the icosahedron on axes through the
centers of opposite faces define ten equatorial
great-circle planes, which do not pass through any vertexes.
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