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

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equal to old CSA

four times of old CSA

half of old CSA

twice of old CSA

answer is C.

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Detailed Solution

Given,

r = 2 r

and

h = 12 h

.
We know, curved surface area of cylinder is

2 π r h

.
So, new curved surface area,

⇒ 2 π (2 r) (12 h)

⇒ 2 π r h

⇒

Old Curved surface area
Thus, the curved surface area remains unchanged.
Therefore, the correct option is 3.

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