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Q.

If the radius of a hemisphere is 3r cm,   then its volume (in cm 3  ) is:


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a

18π r 3  

b

36π r 3  

c

2 3 π r 3  

d

1 3 π r 3   

answer is A.

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Detailed Solution

Given that the radius of a hemisphere = 3r cm.
We have to find the volume.  Volume of a hemisphere = 2 3 π r 3  cubic units.   
= 2 3 π (3r) 3 = 2 3 π 27 r 3 =18π r 3  
The required volume is 18π r 3  .
Therefore, the correct option is 1.
 
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