A) 14 m
B) 220 m
C) 22 m
D) 104 m
Correct Answer: A
Solution :
\[A=\frac{\pi {{d}^{2}}}{4}=154\Rightarrow d\] \[=\sqrt{\frac{154\times 4}{\pi }}=\sqrt{\frac{154\times 4\times 7}{22}}\] \[=\sqrt{{{2}^{2}}\times {{7}^{2}}}=2\times 7=14\,cm\]
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