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The diagonals of a rhombus ABCD intersect at O. Taking 'O' as the centre, an arc of radius $6$ cm is drawn intersecting OA and OD at E and F respectively. The area of the sector OEF is :
- (a)$9\pi$ cm$^2$
- (b)$3\pi$ cm$^2$
- (c)$12\pi$ cm$^2$
- (d)$18\pi$ cm$^2$
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(A) $9\pi$ cm$^2$