Answer:


Explanation:
What is a square root?
A square root is a number that when multiplied by itself, produces a specified quantity.
The square root of 81 is 9. We know this because we can take 9 and multiply it by itself to get 81.
The square root of 9 is 3. We know this because we can take 3 and multiply it by itself to get 9.
Therefore, the square root of the square root of 81 is 3.