Elements of analytical geometry and of the differential and integral calculus (1866)
Davies, Charles, 1798-1876 · New York, Barnes & Co. · leaf 134
BOOK v.] THE HYPERBOLA 133 as a centre, and CH as a radius, desciibe a semi-circum-ference, intersecting AB produced in F and F ; thesepoints will be the foci. The curves may then be described as before. y Equation of the Hjrperbola. … 8. Let F and F\ be thefoci, and denote the distancebetween them by 2c. Denotethe semi-transverse axis CB^ by-4, and the semi-conjugate, (7Z>,by B. Let P be any point ofthe curve, and designate thedistance FP, by r\ and FP^ by r\ then, 2^1 will denote the given line AB^ to whichthe difference, FP…
Geometry, Analytic · Calculus
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