Plane and solid analytic geometry; an elementary textbook (1901)
Ashton, Charles H. (Charles Hamilton), 1866- · New York, C. Scribner's sons · leaf 179
Fig. 87. determined by finding the intersections of tangents atthe extremities of chords through the point. 2. The polar of any point Px with respect to a centralconic is parallel to the tangent at the point where the diameterthrough Px cuts the conic.
Geometry, Analytic
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