Elements of analytical geometry and the differential and integral calculus (1856)
Robinson, Horatio N. (Horatio Nelson), 1806-1867 · Cincinnati : J. Ernst · leaf 78
e reduction we shall have 2r—x^—x. But VC=x^, and VD=x\ Therefore J)C=p, that is.The sub-normal is a constant quantity, double the distance betweenthe vertex and focus. Corollary 2. As TV=VD, and VF^^DC. TF=FC, Therefore, if the point F be the center of a circle and radiusFC, that circle will pass… … 70 ANALYTICAL GEOMETRY.
Geometry, Analytic · Calculus
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