However, we are only interested in the shaded part in the upper right and lower left part of the square.
After we subtract the area of the circle from the square, the four remaining shaded parts are congruent. Therefore, we can find the area of the shaded region by dividing the area of the four shaded parts by 2.
The area of the four shaded corners of the square is (36-9π) m^2. Finally, we divide this by 2 to obtain the area of two of these areas.
36-9π/2≈ 3.86 m^2
