Legendre, A. M. (Adrien Marie), 1752-1833, Brewster, David, Sir, 1781-1868, Davies, Charles, 1798-1876 · New York, Wiley & Long · leaf 162
tude, the altitude of the frustum, because its ver-tex H lies in the lower base. Thus we already know two ofthe three pyramids which compose the frustum. It remaiiiG to examine the third g-FJU. Now, if ^K bedrawn parallel to /F, and if we conceive a new pyramidK-F/H, having K for its vertex and… … LOOK VII. 163 pîane of the base: hence these pyramids are equivalent. Butihe j)yramid K-F/H may be regarded as having its vertex inJ\ and thus its altitude \vill be the same as that of the frustum:as to its base FKH, we are now to show that this is a meanproportional between the bases FGII and fgh.…
Trigonometry · Geometry
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