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Q.

Find the curved surface area of the cylinder if the radius is 3cm and height is 4cm.


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a

55.36  cm 2  

b

65.36  cm 2  

c

75.36  cm 2  

d

70.36  cm 2   

answer is C.

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Detailed Solution

Given that radius is 3cm, height is 4cm.
So, r=3cm, h=4cm.
Now, curved surface area of the cylinder is given by the formula,
CSA=2πrh ⇒CSA=2π 3 4 ⇒CSA=24×3.14 ⇒CSA=75.36  cm 2  
Thus, the CSA of the cylinder is 75.36  cm 2  .
Therefore, option (3) is correct.
 
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