If it's 3d, it's not a circle. It is a donutWhen you say side, do you mean faces or edges? If I had a 3D circle then it would have 2 faces, but if I drew a circle then it would only have 1 face. If you mean edges then it only has 1 edge.
My donuts have a hole in the middle. My circles don't.If it's 3d, it's not a circle. It is a donut
Then it is a cylinderMy donuts have a hole in the middle. My circles don't.