No, a perfect circle has 1.
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A circle has an infinite number of sides.
The base of a cone is a circle, and circle have an infinite amount of sides
A circle can be a polygon. Sometimes a circle can be a polygon that has infinite number of sides.
Zero in the normal course of events. You could say you can approximate a circle by an infinite-sided polygon, and then you would have infinite sides and corners. Or you could say a circle has an inside and an outside.
Theoretically, there are an infinite number of sides a polygon could have. It will never turn into a circle.