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Question 48

Two cylinders A and B are formed by folding a rectangular sheet of dimensions 20 cm×10 cm along its length and also along its breadth respectively. Curved surface area of A is ___ surface area of B.

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Solution

Equal
For cylinder A, h = 10 cm and r =10πcm
Curved surface area of A =2πrh=2π×10π×10=200 cm2
Again, for cylinder B, r=5πcm and h = 20 cm
Curved surface area of B =2πrh=2π×5π×20=200 cm2
Hence, the curved surface area of both the cylinders are same.


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