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Volume of a Cylinder

A rectangular...

Question

A rectangular is 5cm x 23cm is rotated completely about the 23cm side. Find the total surface area of the cylinder so formed.

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Solution

For the thus obtained cylinder,
r = 5 cm
l = 23 cm

Total surface area = 2(pi * r^2) + 2pir*l
= 157 + 722.2
= 879.2 cm^2

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