Plane and solid analytic geometry; an elementary textbook (1905)
Ashton, Charles H. (Charles Hamilton), 1866- · New York, C. Scribner's Sons · leaf 213
r to Fig. 97 ;while, if 71 is a fraction with anodd numerator and an even de-nominator, the curve is similarto Fig. 98. 102. The Cassinian ovaL—The locus of a point, the product ofwhose distances from two fixed points is constant, iscalled a Cassinian oval. The two fixed points are calledthe foci… … Fig. 98.
Geometry, Analytic
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