# Demonstration of Ellipse Definition

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Illustration showing the definition of an ellipse. “An ellipse is a curve which is the locus of a point that moves in a plane so that the sum of its distances from two fixed points in the plane is constant.” The foci and major axis is drawn.

### Keywords

ellipse, oval, ellipses, ovals, conic sections, section, focus, foci, definition, major axis, minor axis### Galleries

Conic Sections: Ellipses### Source

G.A. Wentworth *Plane And Solid Geometry* (Boston: Ginn & Company, 1899) 425

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