Dowling, L. Wayland (Linnaeus Wayland), b. 1867, Turneaure, F. E. (Frederick Eugene), 1866- · New York, H. Holt and company · leaf 125
a 9x2 — 4 2/2 = 65,drawn to the points whose ordinate is 2. 5. Show that the circle is the limiting form of the ellipse as a and 6approach equality. What is the eccentricity of the circle and where are itsfoci? 6. When the semiaxes of an hyperbola are equal, the hyperbola is calledequilateral. Show… … Fig. 67 91. Directrices. Let e represent the eccentricity and a thesemitransverse axis of ■ an ellipse or an hyperbola. The lines drawn perpendicu-lar to the transverseaxis, one at the dis-tance - to the right,e ctand the other - toe the left of the cen-ter, are called thedirectrices. In Figs.67…
Geometry, Analytic
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