Question : If the radius of a right circular cylinder open at both ends is decreased by 25% and the height of the cylinder is increased by 25%, the curved surface area of the cylinder thus formed:
Option 1: remains unaltered
Option 2: is increased by
Option 3: is increased by
Option 4: is decreased by
Correct Answer:
is decreased by
Solution :
The curved surface area of a right circular cylinder before the change, where
The radius is decreased by
The height is increased by
The curved surface area of a right circular cylinder after the change
Hence, the correct answer is 'is decreased by
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