Answer
77.68 in
Work Step by Step
The center of the pulleys are 20 in apart
The radius of the pulley is 6 in
We need to find the length of the belt used in the pulley system
The total pulley length = 20 + 20+ 2* (2πr)/2
= 40 + 2π* 6
= 40 + 12π
= 40 + 37.68
=77.68 in