A) 28 cm.
B) 7 cm.
C) 21 cm.
D) 14 cm.
Correct Answer: D
Solution :
Total surface area of hemisphere \[=3\pi {{r}^{2}}\] \[\therefore \]\[3\pi {{r}^{2}}=1848\] \[\Rightarrow \]\[3\times \frac{22}{7}\times {{r}^{3}}=1848\] \[\Rightarrow \]\[{{r}^{2}}=\frac{1848\times 7}{3\times 22}=196\] \[r=\sqrt{196}=14\,cm.\]
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