A) 4.2 cm
B) 8.4 cm
C) 1.4 cm
D) 2.1 cm
Correct Answer: A
Solution :
[a] Here, Total surface area of hemisphere \[=166.32\,\,sq.cm.\] r\[=\,?\] \[\because \,\,\,3\pi {{r}^{2}}=166.32\] \[3\times \frac{22}{7}\times {{r}^{2}}=166.32\] \[\therefore \,\,{{r}^{2}}=\frac{166.32\times 7}{3\times 22}=17.64\] \[\therefore \,\,r=4.2\,\,cm.\]
You need to login to perform this action.
You will be redirected in
3 sec
