A) 6 cm
B) 18 cm
C) 21 cm
D) 4 cm
Correct Answer: A
Solution :
(a): Here, area of sector, \[2\pi r\left( \frac{\theta }{{{360}^{{}^\circ }}} \right)=l\] Also, length of one \[l=2\pi r\] \[2\pi r=2\pi \times 20\times \frac{108}{360}\] \[\Rightarrow r=\frac{20\times 144}{360}=6\]cmYou need to login to perform this action.
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