Text-book of Euclid's elements for the use of schools : books I - VI and XI (1900)
Hall, H. S. (Henry Sinclair), 1848-1934, Stevens, F. H. (Frederick Haller), 1853-1933 · MacMillan : London · leaf 474
It has twelve faces, twenty vertices, thirty edges. 454 EUCLIDS ELEMENTS. Theorem 7. If F denote the number of facet, E of edges, and Vof vertices in any polyhedron, then will E + 2=F+V. Suppose the polyhedron to be formed by fitting together the facesin succession: suppose also that Er denotes the…
Geometry · Mathematics
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