Plane and solid analytic geometry; an elementary textbook (1905)
Ashton, Charles H. (Charles Hamilton), 1866- · New York, C. Scribner's Sons · leaf 126
. AA hasbeen called the trans- ^~verse or principal axis;BB is called the conju-gate or minor axis of thecurve. If the foci of the ellipseare on the y-axis, thevertex A also lies on that axis, and B on the X-axis (Fig. 60). Its equation is (seeend of Art. 64) 0^ a- … 110 ANALYTIC GEOMETKY [Cii. IX, § GG All the formulas found above hold for [41], except theequations of the directrices, which are e PROBLEMS 1. Find a, h, c, e, and the equations of the directrices in theellipse, (a) 4 a;2 -f- 9 2/- - 36, (h) 9 x- + 4 if = 3G, (c) 3^2 +8/ = 10. 2. Find the…
Geometry, Analytic
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