Divide the perimeter by 4, to get the length of one side. From there, you can easily calculate the area.
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The area of a square is a function of the perimeter of the square.
If the area of a square is 12 the perimeter is: 13.86
The area of a square with perimeter 28cm is: 49 cm2
The area of a square that has a perimeter of 12 feet is: nine square feet.
If the perimeter of a square is 40 mm the area is: 100 mm2