Add together the lengths of each side of the plane shape.
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Square is a special case of a rectangle and the same formula may be used to find the perimeter
yes
well, first you use the formula and then you do A=formula problem sloved A=n*(n) A=the answer= to n times n
to find the perimeter of a circle you simply do this (pi x D )
To find the perimeter of a triangle, use the formula a+b+c. ex: The sides are 4, 8, and 6. P=a+b+c P=4+8+6+= P=18