An ellipse is a geometric shape that resembles a stretched circle, defined as the set of all points where the sum of the distances from two fixed points, called foci, is constant. This property allows ellipses to exhibit unique characteristics, including their symmetrical shape and the way they relate to conic sections. The study of ellipses is essential for understanding advanced conic theory and the work of mathematicians like Apollonius, as well as their properties in geometry.
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