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OAB is sector of a circle with centre O and radius $7 \text{ cm}$. If length of arc $\text{AB} = \frac{22}{3} \text{ cm}$, then $\angle AOB$ is equal to
- (a)$(\frac{120}{7})^\circ$
- (b)$45^\circ$
- (c)$60^\circ$
- (d)$30^\circ$
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Ans: (C) $60^\circ$