A) \[\text{7 cm}\]
B) \[\text{14 cm}\]
C) \[\text{21cm}\]
D) \[\text{28 cm}\]
Correct Answer: A
Solution :
| [a] \[\pi {{r}^{2}}=154\] |
| \[\Rightarrow \,\,\,\,\,\,\,\,\,\,\,\,\,\,\frac{22}{7}\times {{r}^{2}}=154\] |
| \[\Rightarrow \,\,\,\,\,\,\,\,\,\,\,\,\,\,r=7\,cm\] |
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