Question 115557
Remember, the area of a square is {{{A=s^2}}} where A is the area and s is the side length of the square. So in this case A=625


{{{625=s^2}}} Plug in A=625



{{{sqrt(625)=sqrt(s^2)}}} Take the square root of both sides



{{{s=25}}} Simplify


So the length of the side is 25 mm


Does this make sense?