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Question

The diameter of a road roller is 40 cm. It is 70 cm long. What is the area of levelled surface, when it rolls once?


  1. 2200 cm2

  2. 17600 cm2

  3. 4400 cm2

  4. 8800 cm2


Solution

The correct option is D

8800 cm2


Radius of roller (r) =402=20 cm

Length of roller =70 cm

Area of levelled surface when it rolls once = curved surface area

=2πrh

=2×227×20×70

=8800 cm2

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