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Moderate

Tangent Circle Area

ACTMAT-6EKYVO

In the figure below circles O and B are internally tangent at A.

If $AB = 12$ cm, what is the area of the region inside circle B, but outside circle O, in square centimeters?

A

$ 36 \pi $

B

$ 72 \pi $

C

$ 108 \pi $

D

$ 144 \pi $

E

$ 160 \pi $