It is a SPECIAL form of ellipse.
In an ellipse the centre and the two foci are at separate points on one axid.
In a circle the centre and the two foci are ALL at the circle centre.
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An oval. Or an ellipse.
A circle,An ellipse, A sphere,A normal (Gaussian) distribution.A circle,An ellipse, A sphere,A normal (Gaussian) distribution.A circle,An ellipse, A sphere,A normal (Gaussian) distribution.A circle,An ellipse, A sphere,A normal (Gaussian) distribution.
Yes; the circle is a special case of an ellipse.
circle
A circle is an ellipse with an eccentricity of zero. Both foci of that ellipse are at the same point. In the special case of the circle, that point is called the "center".