Q.

The radii of the circular bases of a right circular cylinder and a cone are in the ratio of 3: 4 and their heights are in the ratio of 2: 3 . What is the ratio of their volumes?


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a

6:7  

b

1:4  

c

9:8  

d

1:5   

answer is C.

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Detailed Solution

Given that radii of cylinder and cone are in ratio 3:4 and heights are in ratio 2:3.
The volume of the cylinder =π r 1 2 h 1  , here r 1   is radius of cylinder, h 1   is height of cylinder.
The volume of the cone = 1 3 π r 2 2 h 2   here r 2   is radius of cone, h 2   is height of cone
The ratio of their volumes,
Question ImageThus, the required ratio of their volumes is 9:8  .
Therefore, option (3) is correct.
 
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