Legendre, A. M. (Adrien Marie), 1752-1833, Brewster, David, Sir, 1781-1868, Davies, Charles, 1798-1876 · New York, Wiley & Long · leaf 151
TION VIII. THEOREM. If two parallelopipedons have a common base, and their upperbases hi ike same phnic and between the same parallels, theywill be cquicalent. Let the f)aralleIopipe-dons AG, AL, have thecommon base AC, andtheir upper bases EG,MK, in the same plane,and between the sameparallels HL,… … IS equal to the triangular the trianirular prism AEI-MDII,prism BFK-LCG. .Since AE is parallel to BF, and HE to GF, the angle. AEI---HIK, HEI = GIK, and IIEA^GIB. Also, since EF andIK are each equal to AB, they are ecjual to each oiher. Toeach add FI, and there will result El equal to FK : hence…
Trigonometry · Geometry
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