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[–] sqeak ago  (edited ago)

Technically all points on a circle are equally far from the center of the circle. Which means an ellipse is not a circle.

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[–] nicky_haflinger 0 points 1 point (+1|-0) ago 

If the two foci of the ellipse are coincident then the result is a circle. Ellipses with foci that are fairly close look very circle-like. It might be an ellipse but it would have been nice to have an explicit demo.

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[–] sillyquiet ago  (edited ago)

not all ellipses are circles. Circles, however, are a special case of ellipse in which the both foci coincide, which means some ellipses are in fact circles.

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[–] sqeak ago  (edited ago)

Please demonstrate, I don't understand, all I can find is this.