Question

How many sides are in a circle.

Answer 1

There is no side in a circle and no edges as well.

Answer 2

If you think of the circle as a disk then it it has an up-side and a down-side. If you think of it as a curve, then it has an inside and an outside. If you think of it as the limit of an n-sided regular polygon, then one can justify the answer that the circle has infinitely many infinitesimal sides.