Definition of Ellipse
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Diagram of an ellipse that can used to illustrate the definition. “The constant ration between the distances of a point on an ellipse from the focus and the directrix equals the linear eccentricity divided by the semi major axis.”
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Conic Sections: EllipsesSource
Arthur Latham Baker The Elements of Solid Geometr with Numerous Exercises (Boston, MA: Ginn & Company, 1893)
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