Snyder, Virgil, 1869-1950, Sisam, Charles Herschel, b. 1879 · New York : H. Holt and Company · leaf 86
Fig. 29. The sections of the surface by the planes y = k are the con-gruent parabolas V^lfi a- 0- ..n 0 The vertices of theseparabolas describe theparabola ^ = - 2 H2r, a- = 0. The sections by theplanes x = A arecongruent parabolaswhose vertices de-scribe the parabola … ^jLtf^i* 62. The quadric cones. The cone (Art. 46) ^ 1. = 0 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 2; = c is the ellipse The cone is therefore the locus of a line which passes through theorigin and…
Geometry, Analytic
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