Point Distances to Foci on Ellipse Small 320×127 Medium 640×254 Large 1024×406 Download Tiff Original 2400×952 | (130.3 KB) Description Illustration of half of an ellipse. "The sum of the distances of any point from the foci of an ellipse is greater than or less than 2a, according as the point is without or within the curve." Keywords center, chords, conic sections, ellipse, ellipses, focal chord, focal radii, foci, focus, major axis, minor axis, oval, ovals, radius, section Galleries Conic Sections: Ellipses Source: G.A. Wentworth Plane And Solid Geometry (Boston: Ginn & Company, 1899) 433
