A) 22cm.
B) 16.1
C) 28.5 cm.
D) 11 cm
Correct Answer: D
Solution :
\[\theta ={{30}^{o}}=\frac{30\times \pi }{180}\] \[=\frac{\pi }{6}\]radian \[\therefore \]\[\theta =\frac{l}{r}\] \[\Rightarrow \frac{\pi }{6}=\frac{l}{21}\] \[\Rightarrow \]\[l=\frac{21\pi }{6}=\frac{21}{6}\times \frac{22}{7}\] \[=11\,cm.\]
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