Plane and solid analytic geometry; an elementary textbook (1905)
Ashton, Charles H. (Charles Hamilton), 1866- · New York, C. Scribner's Sons · leaf 267
coordinate has the unique sign inthe equation. When a = h, the equation becomes —+ ^—— =1, aP aP c^which is the equation of an unparted hyperboloid of revo- 250 ANALYTIC GEOMETRY OF SPACE [Ch. V, § 80 1 z^-*^ r%i£i y^ lution about the Z-axis. The equations ;; + t^ 4- 7^ 999 a^ h^ ¥ and — — ^- 4- —…
Geometry, Analytic
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