I am not sure, but we're you going to put up a sum.
Answer:
The shaded area is 
Step-by-step explanation:
we know that
The shaded area is equal to the area of the large square minus the area of the two smaller squares
so

Calculate the shaded area
Remember that

substitute

True because the center is (2,1) and radius is 2
Answer:
C
Step-by-step explanation: