The elements of plane analytic geometry. A text-book including numerous examples and applications, and especially designed for beginners (1903)
Briggs, George R. (George Russell), b. 1853, Bôcher, Maxime, 1867-1918 · New York, J. Wiley & sons; [etc., etc.] · leaf 134
126 ANALYTIC GEOMETRY. ence remains constant. The otlier l^ranch may be generatedin the same manner by placing the pencil F at some … point of the other branch before drawing the string tightat H, In the equation of the hyperbola, § 64, we used b to represent^c^ — a-; it will not, as for the ellipse, be the length of the in-tercepts on O V, for the hyperbola does not cut O V. We shall,however, call that portion of the axis of y…
Geometry, Analytic -- Plane
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