A) 16cm
B) 18cm
C) 20cm
D) 33cm
Correct Answer: D
Solution :
Length of arc \[SR=\frac{\theta }{360{}^\circ }\times 2\pi r\] \[=\frac{90{}^\circ }{360{}^\circ }\times 2\times \frac{22}{7}\times 21\] \[=\frac{83160}{2520}=33\,cm\]
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