Question

A cylindrical road roller is of length 2 m and diameter 84cm . Find the number of revolution it has o make to cover an area of 7920sqmetre.

Answer 1

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Answer 2

Diameter = 84 cm
Radius = 84/2 = 42 cm = 0.42

Length = 2 m

CSA of cylinder = 1 Revolution
2πrh = 2 x 22/7 x 0.42 x 2 = 5.28 sq m

5.28 sq m = 1 Revolution
7920 sq m = ?
Total number of revolutions = 7920/5.28 = 1500

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