☁️ Answer ☁️
annyeonghaseyo!
Your answer is:
9
"Square root of 81 is 9. Both 81 and its square root 9 are perfect squares. 81 is the largest two digit perfect square having the largest single digit number as its square root (9). Square root of 81 is 9."
Hope it helps.
Have a nice day noona/hyung!~  ̄▽ ̄❤️