Normally you just add the sides of a polygon.
If it's a rounded polygon (ex:circle, oval, etc), then there is a different formula. (ex:circle=pi*r squared)
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Any 5 sided polygon is a pentagon. There is no formula for it. We have formulas for area and perimeter. Perhaps that is what you are asking?
The perimeter is the sum of the lengths of all sides.
Distance around a polygon
148
Such a polygon is not possible.