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If radius of a cylinder is halved and height is doubled then the curved surface area is,

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four times

halved

No change

double

answer is A.

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Detailed Solution

Given, new radius

= 12 r

,
New height of the cylinder

= 2 h

.
We know, curved surface area of the cylinder is

2 π r h

.
New curved surface area is,

⇒ 2 π × 12 r (2 h)

⇒ 2 π r h

which is equal to the old curved surface area of the cylinder.
So, the curved surface area will remain the same.
Therefore, the correct option is 1.

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