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 436
circle). 17. A tetrahedron is a pyramidon a triangular base: it is thus con-tained by four triangular faces. 18. Polyhedra are classified according to the numberof their faces: thus a hexahedron has six faces ;an octahedron has eight faces ;a dodecahedron has twelve faces. 19. Similar polyhedra are… … 416 euclids elements. 21. It will be proved (see page 451) that there canonly he five regular polyhedra.They are defined as follows :— (i) A regular tetrahedron isa solid figure bounded by fourplane faces, which are equal and•equilateral triangles. (ii) A cube is a solid figurebounded by six plane…
Geometry · Mathematics
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