9 because 9x9=81. For example if you were finding the square root of 25, it would be 5 because 5x5=25.
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The square root of -81 = 9 i9i
The square root of 81 is 9
The square root of 6561 is 81
81 square meters = 871.88 square feet.
9² = 9 × 9 = 81