The length of the side of a square of area x square units is sqrt(x) units.
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It is the same as its length, and if that is not given, it is the square root of the area.
The formula for the area of the square is length multiplied by width.
The length of the side of a square with the given area of 81m squared is: 9 meters.
Square root the area. The length and width of a square are always the same and length times width is the area so this is how you get the area.
area - width = length