Question

A roller 2 metre long and 0.7 m in diameter makes 60 revolution in a minute on a road. how much area is rolled by it?

Answer 1

Area covered by the roller would be $60 * (2\pi rh) = 120\pi rh = 120 * \frac{22}{7} *0.35*2 = 264$

Answer 2

area of the road = 60*(the lateral surface area of the roller)
=>60*2*22/7*0.35*2 = 264