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Focal Radii of an Ellipse
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Description: 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."
Source: G.A. Wentworth Plane And Solid Geometry (Boston: Ginn & Company, 1899) 429
Keywords: conic sections, section, ellipse, ellipses, oval, ovals, focus, foci, major axis, minor axis, center, focal radii, focal chord, radius, chords
Copyright: 2009, Florida Center for Instructional Technology. See license.
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