1.

The diameter of a road roller is 80 centimetres and it is 1.20 metres long:What is the area of levelled surface, when it rolls once?

Answer»

Radius of roller = 40 cm

Length of roller (height) = 1.20 m = 120 cm

Area of leveled surface, when it rolls once

= Curved surface area of the roller

= 2 × π × Radius × Height

= 2 × 3.14 × 40 × 120 = 30144 cm2 = 3.0144 m2



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