Yes. A polygon is by definition a shape enclosed by multiple sides - the smallest number of sides that enclose an area is three.
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At least three of each.
A polygon must have at least three sides.
There's no such thing as a two-sided polygon. In order for a shape to be a polygon, it has to have at least three sides.
It is a polygon
It has to have at least three sides, and have at least three equivalent angles.