The diagonal of a square has a length of 8 radical 2 cm. Find the length of a side of the square.

In any square the diagonal = a*sqrt (2), where a = length of any side (in a square all sides are equal in length)

*BTW sqrt (2) = radical 2 ... Just to be sure it's intelligible ...

Soo ... if the diagonal = 8*sqrt (2) cm, then the side (a) = 8 cm.

:-)