A) \[\frac{r}{\sqrt{2}}\]
B) 2r
C) \[r\sqrt{3}\]
D) \[\sqrt{2r}\]
Correct Answer: C
Solution :
(c): Let the radius of the new cylinder be R then. \[3\pi {{r}^{2}}h=\pi {{R}^{2}}h\] \[\Rightarrow {{R}^{2}}=3{{r}^{2}}\Rightarrow R=\sqrt{3r}=r\sqrt{3}\]
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