Legendre, A. M. (Adrien Marie), 1752-1833, Brewster, David, Sir, 1781-1868, Davies, Charles, 1798-1876 · New York, Wiley & Long · leaf 99
BOOK IV. 99 PROBLEM II. … To find a fourth proportional to three gioen lines, A, B, C. Draw the two indefi-nite lines DE, DF, form-ing any angle with eachother. Upon DE takeDA=A, and DB = B;upon DF take DC = C ;draw AC ; and throughthe point B, draw BXparallel to AC ; DX will be the fourth proportional required ;for, since…
Trigonometry · Geometry
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