Line Bisecting Angle Between Focal Radii on Ellipse

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Illustration of half of an ellipse. “If through a point P of an ellipse a line is drawn bisecting the angle between one of the focal radii and the other produced, every point in this line except P is without the curve.”


G.A. Wentworth Plane And Solid Geometry (Boston: Ginn & Company, 1899) 434


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