81 m2
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The square root of 81 is 9
9x9=81 Each side would be 9; so 9x4=36 if it's a square.
If it was a square, the answer would be 81 square cm. The area will be the product of two numbers whose sum is half the perimeter.
The square root of -81 = 9 i9i
The square root of 6561 is 81