If the radius of a cylinder is doubled and its height is halved, what happens to its curved surface area?

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• A It is doubled.
• B It is halved.
• C It remains the same.
• D It becomes four times.

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Answer: C. It remains the same.

CSA of a cylinder = 2πrh. New CSA = 2π(2r)(h/2) = 2πrh, so it remains the same.

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