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
square root of (2 ) square root of (3 ) square root of (5 ) square root of (6 ) square root of (7 ) square root of (8 ) square root of (9 ) square root of (10 ) " e " " pi "