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Q.

The curved surface area of a cylindrical rod is 132  cm 2  . Find its length if the radius is 0.35 cm  .


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a

60 cm

b

50 cm

c

40 cm

d

70 cm 

answer is A.

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Detailed Solution

It is given a cylindrical rod of curved surface area 132  cm 2  .
Radius of rod = 0.35cm
Let the length of the rod be `h’ cm.
The surface area of the cylinder , 2πrh=132  
2× 22 7 ×0.35×h=132  
The value of the length of rod will be,
⇒h=132× 7 22 × 1 2 × 1 0.35  
⇒h=3×7× 1 0.35  
⇒h= 2100 35  
⇒  Question ImageTherefore, length of the road is 60cm.
Hence option (1) is correct.
 
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