A) (a). 9 : 4
B) 2 : 1
C) 3 : 1
D) 4 : 9
Correct Answer: A
Solution :
From the question, \[\Rightarrow \] \[2\pi rh+2\pi {{r}^{2}}=8\pi {{r}^{2}}\] \[\Rightarrow \] \[=2\pi rh=6\pi {{r}^{2}}\] \[\Rightarrow \] \[\frac{h}{r}=3\] \[\therefore \] Required ratio \[=\pi {{r}^{2}}h:\frac{4}{3}\pi {{r}^{3}}\] \[=3h:4r=9:4\]You need to login to perform this action.
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