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The length of arc subtending an angle of $210^\circ$ at the centre of the circle, is $\frac{44}{3}\text{ cm}$. The radius of the circle is :
- (a)$2\sqrt{2}\text{ cm}$
- (b)$4\text{ cm}$
- (c)$8\text{ cm}$
- (d)$\frac{1}{4}\text{ cm}$
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(b) $4\text{ cm}$