You could but it would not be a particularly meaningful measure.
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multiply the width by 2 and then subtract that to the perimeter then divide the answer by 2 to get the length
you multiply the length by two then you multiply the width by two and then add the two answers 2l+2w
you need length and width length multiply width = area length + length + width + width = perimeter
Perimeter = 2 x (length+width). You add the length to the width and multiply the sum by two.
There is nothing difficult about calculating the perimeter of a square, You just multiply the length of a side by 4.