Legendre, A. M. (Adrien Marie), 1752-1833, Brewster, David, Sir, 1781-1868, Davies, Charles, 1798-1876 · New York, Wiley & Long · leaf 160
ter than the prism «-ABC. But inreality it is less ; for they have the same base ABC, and thoaltitude Ax of the first is less than Aa the altitude of the second.Hence the supposed ine(|uality b(;tween the two [)yrami(is can-not <*xist ; h«*nce the two pyramids S-ABC, S-^/Ar, having… … Let F-ABC be a triangularpyramid, ABC-DEF a triangularprism of the same base and thesame altitude ; the pyramid willbe equal to a third of the prism. Cut off the pyramid F-ABCfrom the prism, by the planeFAC ; there will remain the solidF-ACDE, which may be consi-dered as a quadrangular…
Trigonometry · Geometry
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