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A circle is by definition 2-dimensional (flat). If you mean a circle that is wider in one direction than the other, than you are thinking of an ellipse.
It could be an oval unless it is squashed completely flat.
the bible says so
Curved and flat faces.
In geometry, a circle is a two-dimensional object, so it does not have a surface. Only three-dimensional objects have surfaces. A disc is a flat, circular three-dimensional object.