Help Asap. please and thank you

#3 Close, but you're confusing diameter with radius.

The answer would be \(\pi\cdot \frac{1}{2}\cdot(3^2-1^2-2^2) = \pi \cdot \frac{1}{2} \cdot 4 = \boxed{2\pi}\)

The area of the blue region is pi.

Semi circle areas are   1/ 2 pi r^2     

   calculate the largest one (r = 6)  ....and subtract the two smaller ones ( r= 2 and 4)

1/2 pi  (   6^2   - 2^2 - 4^2)

1/2 pi ( 16) = 8 π   units²