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The length of an arc of a circle with radius $12 \text{ cm}$ is $10 \pi \text{ cm}$. The angle subtended by the arc at the centre of the circle, is :
- (a)$120^{\circ}$
- (b)$6^{\circ}$
- (c)$75^{\circ}$
- (d)$150^{\circ}$
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(D) $150^{\circ}$