A road roller takes 750 complete revolutions to move once over to level a road. Find the area of the road if the diameter of the road roller is 84 cm and its length is 1 m.
It is given in the question that,
Diameter = 84 cm
Hence,
Radius = 42cm
Length = 1m = 100cm
Now,
Lateral surface area = 
= 
= 26400 cm2
Hence, the area of the road will be
= lateral surface area × no. of rotations
= 26400 × 750
= 19800000 cm2
= 1980 m2
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