It is the perimeter of the polygon
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Yes.
An infinite number. A polygon with any number of sides can be equilateral (ie have sides of equal length).
Adding the lengths of the straight sides of any polygon will give its perimeter. In the case of regular polygons it will be the length of the side multiplied by the number of sides. But in the case of a non-regular polygon all the individual sides' lengths will be added to give you the perimeter.
Any polygon with 4 sides is a quadrilateral
Any regular polygon