NIFT UG 2010 Question Paper with solutions

Question : 125 of 149

Marks: +1, -0

If the diameter of a cylinder is 28 cm and its height is 20 cm, then the surface area (in

\cm^2

) is

Solution:

Surface area of cylinder

=2πrh+2πr^{2}

=2×\;\;{22}/{7}×14×20+2×\;\;{22}/{7}×14×14

=1760+1232=2992{cm}^{2}

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