Find the area of a square with radius 6 square root 2

I may try.

We don't have any other informations, so the formula to find the side (since the radius is half the side) is r*2

s = (6√2) * 2 = 12√2

A = s*s (or s²) = (12√2) ² = 12² * √2² = 144*2 = 288 square units