add all the sides ???
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Finding the perimeter of a polygon is finding how far it is in total along all the edges of the polygon; whereas finding the area of a polygon is finding how much space the polygon covers. The perimeter of a polygon forms the boundary around the area of the polygon.
The formula is:Perimeter = (length of one side) x (number of sides)
Multiple of total no of sides and length of each side.
The general formula isPerimeter = (sum of the lengths of all sides)In the special case of a regular polygon,Perimeter = (length of one side) x (number of sides)
for perimeter all you do is add up all the lengths of the sides.