Plane and solid analytic geometry; an elementary textbook (1901)
Ashton, Charles H. (Charles Hamilton), 1866- · New York, C. Scribner's sons · leaf 128
— 62 = c2. [40] From this we see that BF, being the hypotenuse of aright triangle whose legs are c and 6, is equal to a. Italso shows that a isalways larger than 5, orthat AA(=2a), theaxis perpendicular to thedirectrices, is larger thanBB(=2b). AA hasbeen called the trans-verse or principal axis;BB… … V + ^=1. [41] 110 ANALYTIC GEOMETRY [Ch. IX, § 66 All the formulas found above hold for [41], except theequations of the directrices, which are »-*r PROBLEMS 1. Find a, b, c, e, and the equations of the directrices in theellipse, (a) 4a2 + 9/ = 36, , (b) 9a2 + 4/ = 36, (c) 3 ar + $ if = 10. 2. Find…
Geometry, Analytic
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
