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The perimeter of the sector of a circle of radius $21 \text{ cm}$ which subtends an angle of $60^{\circ}$ at the centre of circle, is :
- (a)$22 \text{ cm}$
- (b)$43 \text{ cm}$
- (c)$64 \text{ cm}$
- (d)$462 \text{ cm}$
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(C) $64 \text{ cm}$