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Question

A rectangular sheet of dimensions 25 cm×7 cm is rotated about its longer side. Find the whole surface area of the solid thus generated.

Solution
Verified by Toppr

When a rectangular sheet is rotated about its length, we get a cylinder
where the height of cylinder =7 cm

and the circumference of the base of the cylinder =25 cm

Thus curved surface area =2πrh

=(2πr)×h

=25×7

=175 cm2

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