Question

If a cylindrical barrel measures 22 inch in diameter how many inches will it roll in 8 revolution along a smooth surface

Answer 1

Basically, this item is asking for the circumference of the circular base and multiply the circumference by 8.
That is,
distance rolled = 8(πD)
Substituting the known values,
distance rolled = 8(π)(22 inches)
distance rolled = 176π inches
≈ 552.92 inches