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taking the square root of the area.
Using the formula for the area of a square (Area = side length x side length), we can plug in the given area of 81 in^2:
81 = side length x side length
Now, we can take the square root of both sides to find the length of one of the sides:
β81 = β(side length x side length)
9 = side length
Therefore, the length of one of the sides of the square is 9 inches.