The square root of 324 is 18 so the perimeter must be 4*18 = 72 cm
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A square with an area of 400 square units has a perimeter of 80 units.
You can solve this in two steps. 1) Calculate the length of a side of the square, based on the area. 2) Once you have the length of the side, you can calculate the perimeter.
When the area of a square is 36cm2, its perimeter is: 24 cm
The area of a square which has a perimeter of 40 meters is: 100 m2
The perimeter is 28.