Use your calculator to calculate the square root of 81. Or use trial-and-error, to see which number, when multiplied by itself, gives you 81. (Hint: In this case, it is an integer.)
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9
Area is length times width. So... 9x9=81
The sides of the square will each measure 9 units
81 inches squared, because a square has all 4 sides equal, and since area is width x height, the area is 9 x 9 = 81
The area of square is : 81.0