Ziwet, Alexander, 1853-1928, Hopkins, Louis Allen, joint author · New York, The Macmillan company · leaf 156
140). In Figs. 83, 84, 85, Fis the vertex of the cone, ^ CVC=2 athe angle at its vertex; OQ indicates the cutting plane, CVCthat plane through the axis of the cone which is perpen-dicular to the cutting plane. The intersection OQ of thesetwo planes is evidently an axis of symmetry for the conic.… … as does 0 (Fig. 84), or meets FC at a point C of the otherhalf-cone (Fig. 86). If the angleCOQ be called p, the conic is a parabola if ;8 = 2 ce (Fig. 83),an ellipse if yS > 2 « (Fig. 84),a hyperbola if /J < 2 « (Fig. 85). In each of the three figures (7(7represents the diameter 2 r of…
Geometry, Analytic
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