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Q.

Curved surface area of hemisphere of diameter 2r is:


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a

2πr2

b

3πr2

c

4πr2

d

8πr2  

answer is A.

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Detailed Solution

Given that the diameter of hemisphere=2r.
Then,
Radius= d 2 ⇒Radius= 2r 2 ⇒Radius=r   As we know that, the curved surface area of a hemisphere is given by, 2π r 2  .
Therefore, the curved surface area of hemisphere of diameter 2r =2πr2.
Hence option (1) is correct.
 
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