Find the area of the square and subtract it with the area of the inscribed circle. The area of the square is 8m*8m=64 m^2. The area of the circle is πr^2=π(8/2)^2=π(4^2)=16π=50.27m^2. Their difference will be the area of the shaded region. So the area of the shaded region is 64-50.27=13.73m^2, so your closest choice would be C.
