The answer depends on what 324 is. A side of a shape with an indeterminate number of sides, or the area of some regular or irregular shape.
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If the area of the square is 324 square inches then its perimeter is 4*18 = 72 inches
72
you divide the area by four and now you can find the perimeter
Area of square: 324 square inches Perimeter of square: 72 inches
324 meters if 81 m is a side length 36 meters if 81 m is the area