You'd just add all the sides up so if you wanted a formula for it it'd be 2L + 2W = permitter
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Area of a rectangle: a = l * w
The formula for perimeter of a rectangle is: P=2L+2W where L is the length and W is the width of the rectangle.
Area of rectangle is l x b. Where l is length and b is breath of the rectangle.
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it is the formula for both a rectangle and a square. remember a square is a rectangle, but a rectangle is not a square (what i mean is a square has to have all 90 degree angles and four sides that are all the same length a rectangle doesn't have all the same lengths. but a rectangle is a shape with all 90 degree angles, and a square fits that discription)