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Q.

In a cylinder, radius is doubled and height is halved then curved surface area will be

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a

equal to old CSA

b

four times of old CSA

c

half of old CSA 

d

twice of old CSA

answer is C.

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Detailed Solution

Given,
r=2r   and h= 1 2 h   .
We know, curved surface area of cylinder is 2πrh  .
So, new curved surface area,
⇒2π(2r)( 1 2 h)   ⇒2πrh   ⇒   Old Curved surface area
Thus, the curved surface area remains unchanged.
Therefore, the correct option is 3.
 
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