Snyder, Virgil, 1869-1950, Sisam, Charles Herschel, 1879-, Hill, Theodore Preston. Early American mathematics books. CU-BANC · New York, H. Holt and Company · leaf 90
FIG. 29. The section of the surface by the planes y = fc are the congruent parabolas The vertices of theseparabolas describe theparabola The sections by theplanes x=k arecongruent parabolaswhose vertices describe the parabola ^ = 2n*, ?/ = 0. a2 … 62. The quadric cones. The cone (Art. 46) _a2 6a c2 72 FORMS OF QUADRIC SURFACES [CHAP. VI. is called the real quadric cone. Its vertex is at the origin. Thesection of the cone by the plane z = c is the ellipse The cone is therefore the locus of a line which passes through theorigin and intersects…
Geometry, Analytic
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