(Help pls :D) Thank you in advance :)

If I know the area of a square, how do I find the side length?
a.) square the area
b.) divide the area by 2
c.) divide the area by 4
d.) the square root of the area
Which of the following is an example of a perfect square?
a.) 8
b.) 9
c.) 10
d.) 11
8. What is the square root of a perfect square number?
a.) even
b.) irrational
c.) odd
d.) rational