Choose the correct formula for surface area of a cylinder.
2πr2+2πrh
πr2+πrh
2πr+2πrh
2πr2+πrh
A
2πr2+πrh
B
2πr2+2πrh
C
2πr+2πrh
D
πr2+πrh
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Solution
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A cylinder comprises two circles and one rectangle as given in the figure
The surface area of a circle is πr2 where r is the radius and the surface area of a rectangle is 2πrh.
⟹ Surface area of cylinder =2× area of the circular base + area of the rectangle
⇒ Surface area of cylinder =2πr2+2πrh
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