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 434
11. A solid angle is that which is made by three ormore plane angles which have a common vertex, but arenot in the same plane. A solid angle made by threeplane angles is said to be trihedral;if made by more than three, it issaid to be polyhedral. A solid angle is sometimes calleda corner. … 12. A solid figure is any portion of space bounded byone or more surfaces, plane or curved. These surfaces are called the faces of the solid, and the inter-sections of adjacent faces are called edges. 414 EUCLIDS ELEMENTS. POLYHEDRA. 13. A polyhedron is a solid figure bounded by planefaces. Notk. A…
Geometry · Mathematics
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