Hart, C. A. (Clara Avis), b. 1863, Feldman, Daniel D., b. 1872 · New York, American Book Co · leaf 355
Tetrahedron Hexahedron Octahedron Dodecahedron Icosahedron BOOK VII 345 723. Historical Note. The Pythagoreans knew that there werefive regular polyhedrons, but it was Euclid who proved that there can beonly five. Hippasus (arc. 470 b.c), who discovered the dodecahedron, issaid to have been drowned…
Geometry, Plane · Geometry, Solid
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