Plane and solid analytic geometry; an elementary textbook (1905)
Ashton, Charles H. (Charles Hamilton), 1866- · New York, C. Scribner's Sons · leaf 263
Fig. 14. axes respectively, and diminishing in size as the cuttingplane moves off from the origin to the points where thesurface cuts the axes. … 2^2 y2i ^2 If a = 5, the equation becomes -^ + 2 ^ ^ ^ ci a c Sections made by planes parallel to the JC-F-plane willnow be circles, whose centres lie along the Z-axis, and Ch. V, § 29] QUADRIC SURFACES 247 the surface is an ellipsoid of revolution about the Z-axis. Similarly, ^V|l + ^=1 and ^ + |…
Geometry, Analytic
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