Osgood, William F. (William Fogg), 1864-1943, Graustein, William Caspar, 1888-1941, joint author · New York, The Macmillan company · leaf 97
the axis of x perpendicular to Dand passing through F. Let us dothis, choosing the positive sensefrom A toward F. For the axis of y three simplechoices present themselves, namely: (a) through A; (b) along D; (c) through F. Perhaps (b) seems most natural; but (a) has the advantage that the curve… … Fig. 4 EF m. AW-*, and BA-Z. THE PARABOLA 91 ByCh. I, §3 On the other hand, the distance of P from D is.By definition, these two distances are equal, or: /; (i) v(* + ^ = x + -. Sqnare each side of the equation, so as to remove the radical,and expand the binomials : (2) a? — mx + — + y2 = a2 + ma…
Geometry, Analytic
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