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A piece of wire $20$ cm long is bent into the form of an arc of a circle of radius $\frac{60}{\pi}$ cm. The angle subtended by the arc at the centre of the circle is:
- (a)$30^\circ$
- (b)$60^\circ$
- (c)$90^\circ$
- (d)$50^\circ$
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(B) $60^\circ$