Question

A road roller makes 200rotations in covering 220m . Find the radius of the roller.

Answer 1

road roller covering distance 220m by 200 rotations
hence ,
1 rotation it covering distance=220/200m

but we know
1 rotation length=2πr
so, 220/200=2πr
220/200=2 x 22/7 x r
r=35/200=175/1000
=0.175 m=35/2cm