Question

a roller of diameter 70 cm and the length 2 m is rolling on the ground ​

Answer 1

Step-by-step explanation:

Given diameter of roller 35 cm and length is 2 m

then radius of roller =

2

70

=35cm=0.35m

Then surface area of roller =2× 7/22

×(0.35)×2=4.4m

Then area cover by roller in 50 revolutions =50 times4.4=220sqm