Snyder, Virgil, 1869-1950, Sisam, Charles Herschel, 1879-, Hill, Theodore Preston. Early American mathematics books. CU-BANC · New York, H. Holt and Company · leaf 89
ection of the paraboloid by the plane z = k is an ellipsewhose semi-axes are a V2 nk and b V2 nk, respectively. If k < 0,the ellipse is imaginary. If k = 0, the ellipse reduces to a point,the origin. As k increases, the semi-axes of the ellipse increasewithout limit. The section of the… … The sections by the planes x =k are the congruent parabolas Their vertices describe the parabola The form of the surface is indicated by Fig. 28.
Geometry, Analytic
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