Plane and solid analytic geometry; an elementary textbook (1901)
Ashton, Charles H. (Charles Hamilton), 1866- · New York, C. Scribner's sons · leaf 255
t as the cutting plane recedesfrom the X-I^-plane in either direction. We have now sufficient information to draw the figure. It is instructive, however, to investigate the plane sec-tions parallel to the other two coordinate planes. 236 ANALYTIC GEOMETRY OF SPACE [Ch, V, § 29 The section made by… … Fig. 16. semi-axes both approach zero, and the hyperbola approachesa pair of intersecting lines. When xx — a, the section isthe pair of straight lines, %- — — = 0, in the plane x — a, intersecting on the X-axis. When xx > a, the equationagain represents an hyperbola, but the transverse axis…
Geometry, Analytic
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