Schmall, Charles Nelson. [from old catalog] · New York, D. Van Nostrand company · leaf 36
. e., referring a figure to two fixedintersecting lines as co-ordinate axes, and studying its prop-erties by Algebraic Analysis, was first introduced byDescartes in his Geometrie in 1637. Before his time, how-ever, algebra had already been applied to the solution ofgeometrical problems somewhat… … Fig. 21. On CO produced drop the _L BD from B. Let OF = x.Now A BOD and AOF are similar. r ^1 + Z2 + Z3 = 90°,but Zl + Z^ = Z4. Reason .••Z3 + Z4 but Z4 + Z5.•.Z3 = Z5. 90°,90°. a:x::b: OD, whence OD = bx BD2 = 62 and BC BO + CO + 2 • CO • OD 62 + c2 + 2 bcx * The teacher should endeavor to dispel…
Geometry, Analytic
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