Question

a road roller makes 1400 revolution .if the radius of the roller is 2.5m, the distance covered is

Answer 1

apply
$2\pi \: r$
it is the distance of 1 revolution and then multiply by 1400

Answer 2

Heya,

Circumference = 2πr
Circumference = 2 × 22 / 7 × 2.5
Circumference = 110 / 7
Circumference = 15.714285
Circumference = 15.71

Distance covered = 15.71 × 1400
Distance covered = 21994m

Hope my answer helps you :)

Regards,
Shobana