Question 19The two circles pictured have the same center $C.$ Chord $\overline{AD}$ is tangent to the inner circle at $B,$ $AC$ is $10,$ and chord $\overline{AD}$ has length $16.$ What is the area between the two circles? $ \ 36 \pi $$ \ 49 \pi $$ \ 64 \pi $$ \ 81 \pi $$ \ 100 \pi $
