Schmall, Charles Nelson. [from old catalog] · New York, D. Van Nostrand company · leaf 175
(ot a A), altitude =orthocenter Suggestion. —Take mid-point of base as origin. Ans. x^ + by — a? = 0 [a, parabola]. 33. FL is the ± from focus on tangent at P. A circle is circum-scribed about the A FLP. Show that the locus of its center is the par-abola y^ = a{2x — a). Given the base = 2 a (of a… … BFig. 114. 119. To find the equation of the ellipse. — Draw EN ± tothe directrix. Now divide FN, internally at A, and exter-nally at A, in the given ratio e: 1. .•.by definition A and A^ are points on the curve, since FA = e . AN ...... (1) and FA = e . AN (2) Now bisect AA in O, calling the…
Geometry, Analytic
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