Add up the lengths of all the sides. (Same for any shape [except a circle])
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To find the ara of a parrllelogram is base x height or a=bxh
P = 2a + 2b Where a & b are the sides of the parallelogram.
The perimeter of a parallelogram is the distance around the outside of the parallelogram. A parallelogram has four sides with opposite sides being congruent. The formula for finding the perimeter is Side A + Side B + Side A + Side B. This could also be stated as 2*Side A + 2*Side B or 2*(Side A + Side B).
Add together all 4 sides if you mean a parallelogram
Perimeter of a parallelogram =(2 x the length of any side) + (2 x the length of either side next to it)