The diameter of a roller is 7 cm and its length is 40 cm. The area covered in one revolution is: 880 sq.Cm 1540 sq.Cm 957 sq.Cm none of these
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r=3.5cm
h=40cm
CSA of cylinder=2πrh
=2*22/7*3.5*40
=44*0.5*40
=44*20= 880cm2
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