A) 2 cm
B) 3cm
C) 4 cm
D) 6 cm
Correct Answer: C
Solution :
Let the radius of the sphere be r. Then curved surface of sphere \[=4\pi \,{{r}^{2}}\] Total surface of cylinder \[=2\pi \] .radius . (radius + height) \[=2\pi \times 4\times (4+4)=64\pi \] \[\therefore \] \[4\pi \,{{r}^{2}}=64\,\pi \] \[r=4\,cm\]You need to login to perform this action.
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