Plane and solid analytic geometry; an elementary textbook (1904)
Ashton, Charles Hamilton, 1866-1936 · New York, C. Scribner's Sons · leaf 177
160 ANALYTIC GEOMETRY [Ch. XII, § 86 intersection of tangents at the extremities of chordsthrough any fixed point. This property enables us to construct the polar of anypoint; for any number of points on the polar may be … Fig. 87. determined by finding the intersections of tangents atthe extremities of chords through the point. 2. The polar of any point P1 with respect to a centralconic is parallel to the tangent at the point where the diameterthrough P1 cuts the conic. Y
Geometry, Analytic
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