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In the given figure, $O$ is the centre of circle. $XYZ$ is an arc of the circle subtending an angle of $45^\circ$ at the centre. If the radius of the circle is $32$ cm, then the length of the arc $XYZ$ is :
- (a)$4 \pi$ cm
- (b)$8 \pi$ cm
- (c)$64 \pi$ cm
- (d)$128 \pi$ cm
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(b) $8 \pi$ cm