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For a rectangle, area equals length times width. To find the length given the width and area, divide the area by the width.
Divide the width by the length: width -------- height
width = (perimeter-2*length)/2
The length and width of a square are equal. Thus, find the square root of the area and the answer = length= width.
length*width = 2*width*width i.e square the width and multiply by 2