Legendre, A. M. (Adrien Marie), 1752-1833, Brewster, David, Sir, 1781-1868, Davies, Charles, 1798-1876 · New York, Wiley & Long · leaf 161
F-CDE has already been proved equivalent to F-ACE ;hence the three pyramids F-ABC, F-CDE, F-ACE, whichcompose the prism ABC-DEF are all equivalent. Hence thepyramid F-ABC is the third part of the prism ABC-DEF> whichhas the same base and the same altitude. Cor. The solidity of a triangular… … I-et S-ABCDE be a pyramid. Iass the planes SEB*, SEC, tliroiigh tliediagonal EB, EC ; the polygonal pyramidS-ABCDE will be divided into several trian-gular pyramids all having the same altitudeiSO. But each ot these pyramids is measuredby multiplying its base ABE, BCE, or CDE,by the third j)artof…
Trigonometry · Geometry
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