Answer:
See Below
Explanation:
The length of the belt is the length around 2 inch radius wheel PLUS length around 8 inch radius wheel.
The length around a circular region is its circumference. The formula is:

Where
C is circumference
r is the radius
We sum up both, given first one radius is 2 and second one radius is 8, so we have:

The length of the belt should be around 62.83 inches