It is 12m
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Area = Length * Length Area = Length2 Length = Area Length = 230 Length = 15.16575..... -Oliver Crow
The length of a square with an area of 81 would be 9.
The length and width of a square by definition are of equal length. The area (A) of a square = d2, where d is the length of one side. If the area is known, then the length of the side of a square, d = √A (square root of A).
Area of a square is length squared or Length * Length. 2.5 * 2.5 = 6.25 square meters
Take the square root of the area.