Question 153900
Hi,

You are absolutely correct.

3.14 * 70^2 = x^2
==> 3.14 * 4900 = x^2
==> 15386 = x^2
Taking square root on both the sides,
124.04 = x

Thus to the nearest millimeter, the side of the square has to be 124 mm.

Good Luck!!!

dolly