The formula for finding the area of a square is ##A=s^2##. How do you transform this formula to find a formula for the length of a side of a square with an area A?

##s = sqrtA##

Use the same formula and change the subject to be ##s##. IN other words isolate ##s##.

Usually the process is as follows: Start by knowing the length of the side.

##"side " rarr " square the side " rarr " Area"##

Do exactly the opposite: read from right to left

##"side " larr " find the square root " larr " Area"##

In Maths:

##s^2 = A##

##s = sqrtA##