A) \[4.2\,cm\]
B) \[8.4\,cm\]
C) \[1.4\,cm\]
D) \[2.1\,cm\]
Correct Answer: A
Solution :
Here, Total surface area of hemisphere\[=166.32\text{ }sq\text{ }cm\]. \[r=?\] \[\because \] \[3\pi {{r}^{2}}=166.32\] \[3\times \frac{22}{7}\times {{r}^{2}}=166.32\] \[\therefore \] \[{{r}^{2}}=\frac{166.32\times 7}{3\times 22}=17.64\] \[\therefore \] \[r=4.2\,cm\]
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