Question:If the radius of the base of a right circular cylinder is halved, keeping the height same, what is the ratio of the volume of the reduced cylinder to that of the original one ? 

A `1 : 4` 
B `1 : 8` 
C `1 : 2` 
D `8 : 1` 

+ Answer
A 

+ Explanation
Let original radius = R. Then, new radius` = (R/2).`

`(Volume of reduced cylinder)/(Volume of original cylinder)`

`=( π xx (R/2) xx h)/(π xx R^2 xx h)`

`= 1/4.`

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Irin Moni

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