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 435
are called edges. 414 EUCLIDS ELEMENTS. POLYHEDRA. 13. A polyhedron is a solid figure bounded by planefaces. Notk. A plane rectilineal figure must at least have three sides ;or four, if two of the sides are parallel. A polyhedron must at leasthave four faces ; or, if two faces are parallel, it must…
Geometry · Mathematics
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