Dowling, L. Wayland (Linnaeus Wayland), b. 1867, Turneaure, F. E. (Frederick Eugene), 1866- · New York, H. Holt and company · leaf 126
nthe preceding article furnishes a convenient method for constiuct-ing an ellipse or an hyper-bola when the eccentricityand the distance from afocus to the correspondingdirectrix are known. Forexample, to construct thehyperbola whose eccentric-ity is f and the distancefrom one focus to the… … FM^ FM ^ 3 QF QF 2 Draw QM and QM and a series of parallels to AB. and QM in L and L\ respectively, and QF in D QFM and QDL are similar, and therefore Let one of these parallels meet QMThe triangles FM: QF:: DL: QD, or the ratio DL : QD is equal to the given eccentricity -|. WithF as center and DL…
Geometry, Analytic
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