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 a road roller is 84 cm and length 1 m.

Given: Diameter of road roller = 84 cm
∴ Radius of road roller (r) = d/2=84/2=42cm
Length of road roller (h) = 1 m = 100 cm
Curved surface area of road roller = 2πrh=(2)22/7x42x100 = 26400 cm²
∴ Area covered by road roller in 750 revolutions = 26400 x 750
= 1,98,00,000 cm²
= 1980 m²
[∵ 1m² = 10,000 cm²]

Hence, the area of the road is 1980 m².

Class 8 Maths Chapter 11 Exercise 11.3 Solution in Video

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