No fixed number. The minimum is 3 sides, for a triangle. Beyond about 20 sides, it's difficult to distinguish it visually from a circle.
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That regular polygon would have 9 sides.
5 sides and it is a regular pentagon
The polygon has 16 sides :)
The polygon would have 72 sides...
It has 180 sides if the interior of the (regular) polygon has a total of 178 'degrees'.