Question

A road roller takes 750 complete revolutions to move once over a level or Road find the area of the road if the diameter of a road roller is 84cm and length is 1 m

Answer 1

diameter =84cm

radius=84/2=42cm

length =1m=100cm

curved surface area of the roller=2×π×r×h

=2×22/7×42×100

=26400cm^2 .

area of the road =26400×750

=19800000cm^2

Answer 2

Length of roller = 1m = 100cm

Circumference of roller = π x D = 22/7 X 84 =  264 cm

Length of road = 264 x 750 = 198000 cm

Width of road = length of roller = 100 cm

Area of road = 198000 x 100 = 19,800,000 cm² or 1980 m²

hope it helps!!