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If in the given figure, $\angle C = \angle D = 90^\circ$, $\angle B = 60^\circ$ and AP = $3$ cm, then the area of the shaded region is :
- (a)$3\pi$ cm$^2$
- (b)$6\pi$ cm$^2$
- (c)$7\pi$ cm$^2$
- (d)$9\pi$ cm$^2$
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(A) $3\pi$ cm$^2$