Question

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

Answer 1

No. of revolutions =750

Diameter of raod roller =84 cm

Length (h)=1 m

Radius $=\frac{84}{2}=42$ cm =0.42 m

$\therefore$ Surface area $=2\pi rh$

$=2\pi \frac{22}{7}\times \frac{42}{100}\times 1m^2$

$=\frac{264}{100}{m}^2$

$\therefore$ Area of road $=\frac{264}{100}\times 750m^2$

$=1980m^2$