9
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No. The sq root of 84 is 9.16555515139. 81 is a perfect square, where the sq root is 9.
If it is: 81/4 times sq rt of 3 Then it could be: 20.25 times sq rt of 3
36 (sq rt 81 x sq rt 16 = 9 x 4 = 36)
To find the length of a side of a square when the area is known, you need to take the square root of the area. In this case, the area is 81 sq m, so the side length would be the square root of 81, which is 9 meters. Therefore, the side of the square is 9 meters.
81 sq metres = 0.0081 hectares.