Yes, for the perimeter of a polygon, you add up all the sides.
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The formula for finding the perimiter of a rectangle is add up all of its sides
If you want the perimeter of a quadrilateral, then finding the midpoints is a complete waste of time! Simply add together the lengths of the four sides.
You add for perimeter...
Answer : To find the perimeter of a square, you add all four sides together. P=s1+s2+s3+s4
The perimeter is the sum of the sides of a polygon. So, to find the perimeter of a pentagon, you need only to add up the 5 side lengths. In the event the pentagon is regular (all equal sides and angles) then you can multiply the measure of the side by 5 to get the perimeter.