Calculus, with applications; an introduction to the mathematical treatment of science (1900)
Hayes, Ellen, 1851- · Boston, Allyn and Bacon · leaf 134
lled the vertices. ANALYTIC GEOMETRY 123 With jB, one extremity of the minor axis, as a centerand with a radius equal to a, strike an arc. This arcwill cut AA! at points F and F equally distant from 0,the common center of the circle and the ellipse. Evi-dently the flatter the ellipse is, the… … Fig. 13. This important ratio is called the eccentricity of theellipse, and is denoted by e. The somewhat similar (£ Q ratio, , is called the ellipticity of the ellipse. ct The eccentricity is evidently a proper fraction. Thepoints F and F are called foci; and the double ordi-nate through either…
Calculus · Geometry, Analytic
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