Plane and solid analytic geometry; an elementary textbook (1905)
Ashton, Charles H. (Charles Hamilton), 1866- · New York, C. Scribner's Sons · leaf 177
Fig. 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 … EiG. 87. determined by finding the intersections of tangents atthe extremities of chords through the point. 2. The polar of any point P^ tvith respect to a centralconic is parallel to the tayigent at the.point where the diameterthrough P^ cuts the conic. Y
Geometry, Analytic
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