It is: 9/121 or 9/11 depending on what you mean
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Sq root of 81 = 9 because 9x9=81Sq root of 121 = 11 because 11x11=1219/11 is the answer.
The square root of -81 = 9 i9i
The square root of 81 is 9
The square root of 6561 is 81
9/13