Question

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 ]

Answer 1

Concept: 1 Mark
Application: 1 Mark

Radius of the road roller = r = 21cm = 0.21m

Diameter = d = 0.42m

Area of the road
$=780\left(2\pi r\right)d$

$=780[2\times \frac{22}{7}\times 0.21\times 0.42]$

$=432.432m^2$