A road roller takes 780 complete revolutions to level a road once. Find the area of the road if the diameter of a road roller is 42 cm. [2 MARKS ]
Concept: 1 Mark
Application: 1 Mark
Radius of the road roller = r = 21cm = 0.21m
Diameter = d = 0.42m
Area of the road
=780(2πr)d
=780[2×227×0.21×0.42]
=432.432 m2