¶ Icosahedron: Great Circles Of
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Index Entry
Icosahedron: Great Circles Of:
"It is a characteristic of the icosahedron’s great circles
59° 02’
54 54
54 54
168° 50’
to make symmetrical interception of themselves. In maintaining triangular grids of their surface an altitude will continue as an edge and the ?____ triangulation, with the exception of the 18° circles which ‘quarter’ the 20 icosahedronal triangles, ______ all have Yes, No, Yes, No, and the set can be made continuous or the other, but not both at the same time."
- RBF holograph, 26 May’48
