Legendre, A. M. (Adrien Marie), 1752-1833, Brewster, David, Sir, 1781-1868, Davies, Charles, 1798-1876 · New York, Wiley & Long · leaf 162
ial pyramids as the polyedron has faces, minus those faceswhich form the solid angle whence the planes of divisionproceed. PROPOSITION XVIII. THEOREM. If a pyramid be cut hi/ a plane parallel to iV.v base^ the frustumthat remains u hm the small pyramid is taken away, is equi-valent to the sum of… … Let S-ABCDE be a pyra-mid cut by the plane ahcde,parallel to its base ; let T-FGHbe a triangular pyramid hav-ing the same altitude and anequivalent base with the pyra-mid S-ABCDE. The twobases may be regarded assituated in the same plane ; inwhich case, the plane ahcd, ifproduced, will form in the…
Trigonometry · Geometry
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