Conic Section Showing an Ellipse
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Illustration showing the definition of an ellipse as a conic section. “The section of a right circular cone made by a plane that cuts all the elements of the surface of the cone is an ellipse.”
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Conic Sections: EllipsesSource
G.A. Wentworth Plane And Solid Geometry (Boston: Ginn & Company, 1899) 442
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