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# Circle Segment and Area

ACTMAT-YLEJXN

The figure below shows a “segment” of a circle, with arc ACB, chord ${\overline{AB}}$, and segment ${\overline{CD}}$, a perpendicular bisector of ${\overline{AB}}$.

If $CD = 4$ and $AB = 16$, what is the area of the entire circle?

A

$16\pi$

B

$25\pi$

C

$36\pi$

D

$49\pi$

E

$100\pi$