21cm each side.
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A square with a side length of 9 units has an area of 81 square units.
The square's diagonal is 11.314 cm
Length of side = sqrt(2304) = 48 cm
To find the length of the side of a square with an area of 36m², you need to take the square root of the area. The square root of 36 is 6, so each side of the square is 6 meters long. This is because the area of a square is calculated by squaring the length of one side.
It is the area of a square whose side is 1 foot in length, and equals 1 square foot or 144 square inches or 1/9 sq yards.