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Q.

If two solid hemispheres of the same base radius r are joined together along with their bases, then what is the curved surface area of this new solid?


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a

4π r 2  

b

5πr²

c

8πr²

d

2πr² 

answer is D.

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Detailed Solution

Given that if two solid hemispheres of the same base radius r are joined together along with their bases.
We know the joining of two-sphere with the same radius along with the radius gives us the hemisphere and the volume of the that hemisphere is equal to 4π r 2  .
And the curved surface area of the that hemisphere is A=2π r 2  , where r is the radius of the hemisphere.
Therefore, option 4 is correct.
 
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