Bailey, Frederick H. (Frederick Harold), 1865- · Boston, London, Ginn & Co. · leaf 182
t line. Let Ax2+By2 + 2 Gx + 2 Fy + C = 0 be the equation of the conic section, and (xi, yi) the coordi-nates of the point Pi. Then if Pi lies on the conic section, itfollows from the definition that the polar of Pi is simply thetangent at Pi, as shown in Fig. 72. In this case, then, the equation… … FlO. 72. case we may draw for the ellipse either one of Figs. 73 and 74,and similar figures for the parabola and the hyperbola.
Geometry, Analytic
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