Question

if radius of roller is 21cm having length 60cm area covering 1 complete revolution​

Answer 1

Answer:

Explanation:

curved surface area of cylinder is 2πrh

radius is 21cm

length/height is 60 cm

now CSA of cylinder is 2*22/7*21*60*

 that is 7920

now rotations in 1 min is

7920 / 60 (1 min is 60 secs)

132 rotations can be completed in 1 minuts

Answer 2

Answer:

sus6ßhxhhxjxbxjzksc