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Chord AB subtends an angle of $40^\circ$ at the centre of the circle of radius $9$ cm. The length of arc AB is :
- (a)$\frac{22}{7}$ cm
- (b)$\frac{198}{7}$ cm
- (c)$\frac{44}{7}$ cm
- (d)$\frac{54}{7}$ cm
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Answer : (C) $\frac{44}{7}$ cm