Math and Arithmetic
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# What is the difference between a circle and a ellipse?

353637 ###### 2011-09-24 17:06:24

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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## Related Questions 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. 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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