An ellipse is a shape on which the sum of the distances from every point to
two points inside called the foci (focuses) is always the same number.
A circle is an ellipse with both foci (focuses) at the same point.
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A circle is perfectly round and an ellipse is oval.
-- the eccentricity or -- the distance between the foci or -- the ratio of the major and minor axes
Basically a circle has a constant radius throughout and an ellipse does not.a circle has a constant radiusan ellipse has two foci. they are at either end of the ellipse
ellipse are added hyperbola are subtracted
In contrast, for an ellipse it is the ''sum'' of these distances that is a constant