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In the given figure, if $AB$ is a tangent to the circle with centre $O$ such that $OB = 6$ cm and $\angle AOB = 60^{\circ}$, then the length of $OA$ is :
- (a)$3$ cm
- (b)$3\sqrt{3}$ cm
- (c)$4\sqrt{3}$ cm
- (d)$12$ cm
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Answer : (D) $12$ cm