For any square, we know the area is given by [tex]A=s^{2}[/tex] where [tex]s[/tex] is the length of one side.
To solve for the length of the side when we know the area, we need to isolate [tex]s[/tex] by taking the square root of both sides:
[tex]\sqrt{A}=\sqrt{s^{2}}[/tex]
[tex]s=\sqrt{A}[/tex]
Substituting given values:
[tex]s=\sqrt{36}[/tex]
[tex]s=6[/tex]
The sides are 6inches long.