Question 156885
As you know,
radius = diameter/2
AND, since the problem stated that the diameter is 1 ft:
radius = 1/2 ft
.
Plug it into:
V = 4/3 π r^3
V = 4/3 π (1/2)^3
V = 4/3 π (1/8)
V = 1/3 π (1/2)
V = 1/6 π 
V = π/6