Will someone help me?

The squares area is 12 by 12 and or 144. The circles area is 354.94. I know this because #pir^2# or 3.14 times the radius of the circle (6) square. I know that in order to find the area of the shaded region I need to subtract 354.94 from 144. But if I do that it would be negative? But how can the shaded area be negative??? I need help