Legendre, A. M. (Adrien Marie), 1752-1833, Brewster, David, Sir, 1781-1868, Davies, Charles, 1798-1876 · New York, Wiley & Long · leaf 136
ame plane, are eqnal(nul parallel, the opposite triauL^les formed hy join inî: the er-tremitirs of these lines will be equal, and their planes will Iteparallel. ^36 GEOMETRY. Let AB, CD, EF, be thelines. Since AB is equal andparallel to CD, the figureABDC is a parallelogram ;hence the side AC is… … PROPOSITION XV. THEOREM. If two straight lines he cut by three parallel planes, theij will bedivided proportionally. Suppose the line AB to meetthe parallel planes MN, PQ,RS, at the points A, E, B ; andthe line CD to meet the sameplanes at the points C, F, D :we are now to show thatAE : EB : : CF :…
Trigonometry · Geometry
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