Question

Find the area covered by a land roller in one revolution if the diameter of the circular end is 91 cm and the width of the roller 130 cm how many revolution will it
make to cover an area of 7436 m²

Answer 1

Diameter = 91cm

Radius = 91/2 cm

Height = 130cm

Area covered by land roller

$=> 2\pi \: rh$

$= > 2 \times \frac{22}{7} \times \frac{91}{2} \times 130 \\ \\ = > 22 \times 13 \times 130 \\ \\ = > 37180$

Revolutions made to cover an area

=> 37,180 ÷ 7436

=> 5

So the revolutions are 5.