Dowling, L. Wayland (Linnaeus Wayland), b. 1867, Turneaure, F. E. (Frederick Eugene), 1866- · New York, H. Holt and company · leaf 88
etwo possible positions. Also the rectangular equation. 58. Polar equation of the parabola. The polar equation of theparabola assumes the simplest form when the pole is taken at thefocus and the initial line is perpendicularto the directrix (Fig. 44). Let P {r, 9) beany point on the parabola. The… … Fig. 44 (3) 59. Polar equations of the ellipse and the hyperbola. Take thepole at the left-hand focus and the initial line coincident withthe transverse axis of the curve (Figs. 45 and 46). Then, foreither curve, the length of the focal radius PF is given by the formula (Arts. 50 and 52) r — a -\-…
Geometry, Analytic
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