a square has 4 equal sides therfore all sides are 25 feet long
the sides joining at each corner form a 90 degree perpendicular angle
to solve for the length of a diagonal line from the opposite corners:
"a" & "b" are for the two sides / "c" is for the diagonal line
a^2 + b^2 = c^2
25^2 + 25^2 = c^2
625 + 625 = c^2
1250 = c^2
c = the square root of 1250
c =35.35 feet