A) \[\text{149 c}{{\text{m}}^{\text{2}}}\]
B) \[\text{154 c}{{\text{m}}^{\text{2}}}\]
C) \[\text{121 c}{{\text{m}}^{\text{2}}}\]
D) \[\text{169 c}{{\text{m}}^{\text{2}}}\]
Correct Answer: B
Solution :
| [b] \[2\pi r-r=37\] |
| \[\Rightarrow \,\,\,\,\,\,\,\,\,r(2\pi -1)=37\] |
| \[r=\frac{37}{2\pi -1}\,\,\,\,\Rightarrow \,\,\,\,\,r=7\,cm\] |
| \[\Rightarrow \] Area \[=\pi {{r}^{2}}=\frac{22}{7}\times {{(7)}^{2}}=154\,c{{m}^{2}}\] |
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