A hollow cylinder of radius 5cm takes six turns about its axis on a horizontal plane, and thereby covers a
distance which is 6 times its length. What is the area of the curved surface (in cm´) of the cylinder?
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Answer:
Distance covered ,
2*pi*r*6 =6*pi*L,
L=2r
Curved area=2*pi*r*L
=2*pi*r*2r
=4*pi*5*5
=100pi (answer)
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