Focal Radii of an Ellipse
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Illustration of half of an ellipse. “If d denotes the abscissa of a point of an ellipse, r and r’ its focal radii, then r’=a+ed, r=a-ed.”
Keywords
ellipse, oval, ellipses, ovals, conic sections, section, radius, focus, center, foci, chords, major axis, minor axis, focal chord, focal radiiGalleries
Conic Sections: EllipsesSource
G.A. Wentworth Plane And Solid Geometry (Boston: Ginn & Company, 1899) 429
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