52 cm
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13cm*13cm =169 square cm.
Trick question. 100. :)
Let's say the side length of a square is x. The square's area is just x2, and its perimeter is 4x. If we want the perimeter to be equal to the area, 4x = x2, so x = 4.
The perimeter of a quadrilateral is 'side + side + side + side = perimeter'. If the quadrilateral is a square, you can simplify this to 'side x 4 = perimeter'.
Perimeter of square = 4 x L where L = length of one side of the square.