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Basically a circle has a constant radius throughout and an ellipse does not.
a circle has a constant radius

an ellipse has two foci. they are at either end of the ellipse

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The simple answer is that an ellipse is a squashed circle.

A more precise answer is that an ellipse is the locus (a collection) of points such that the sum of their distances from two fixed points (called foci) remains a constant. A circle is the locus of points that are all the same distance from a fixed point. If the two foci are moved closer together, the ellipse becomes more and more like a circle and finally, when they coincide, the ellipse becomes a circle. So, a circle is a special case of an ellipse.

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9y ago
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Q: What is the difference between a circle and a ellipse?
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