Question 309658
x^2=40
x=sqrt40
x=6.325 ans. for the length of the sides.
s^2+s^2=d^2
2s^2=d^2
2*6.325^2=d^2
2*40=d^2
80=d^2
d=sqrt80
d=8.945 ans. for the diagonal of the square.