2l+2w=p
where l = length and w = width
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Add up all the sides of the rectangle.
12cm
The formula for finding the perimiter of a rectangle is add up all of its sides
To calculate the perimeter of any rectangle, just use the basic definition of perimeter: in this case, you just add the lengths of the four sides.
The perimeter of a rectangle is found by the following formula: (Length x 2) + (Width x 2) or Length + Length + Width + Width.