for perimeter all you do is add up all the lengths of the sides.
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add all the sides ???
There can be no such formula in general. A formula will exist if the area is a regular polygon (or a circle).
The formula is:Perimeter = (length of one side) x (number of sides)
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)
Multiple of total no of sides and length of each side.