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Question

Find the lateral or curved surface area of a closed cylindrical petrol storage tank that is 4.2 m in diameter and 4.5 m high.

Solution
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Closed cylindrical pipe is in the form of a cylinder
Curved surface area of a cylinder=2πrh
=πdh where d=2r
=227×4.2×4.5 where π=227
=59.4m2

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