A circle is perfectly round and an ellipse is oval.
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ellipse are added hyperbola are subtracted
In contrast, for an ellipse it is the ''sum'' of these distances that is a constant
Ellipse
An ellipse always has two axes of reflection; an oval has one or more.So, an egg-shape is an oval, but not an ellipse.In short an ellipse is an oval, but an oval may or may not be an ellipse.
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.