8.94
You should get a calculator. This would be easier. :)
9
If you mean square ROOT of 81, 9.
The square roots of 81 are -9 and +9.
9 is the square ROOT of 81. Calculating a square root is the inverse operation of squaring a number.
nine sevenths.
The answer is 11 !
8 and 9
Sq root of 81 = 9 because 9x9=81Sq root of 121 = 11 because 11x11=1219/11 is the answer.
Eighty square centimeters
The square root of the square root of 2
4.326
There are infinitely many of them. They include square root of (4.41) square root of (4.42) square root of (4.43) square root of (4.44) square root of (4.45) square root of (5.3) square root of (5.762) square root of (6) square root of (6.1) square root of (6.2)