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
The polygon is called the base of the pyramid. A pyramid having for its base a regular polygon is said to beright when the vertex lies in the straight line drawn perpendicularto the base from its central point (the centre of its inscribed orcircumscribed circle). 17. A tetrahedron is a pyramidon a…
Geometry · Mathematics
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