I need help on finding the volume, can you explain step by step please?

The formula of the volume of the cylinder is
[tex]V=\pi r^2h[/tex]Where:
r is the radius of its base
h is its height
Since the radius is 1/2 the diameter
Since the diameter of the base is 8 ft, then
[tex]\begin{gathered} r=\frac{1}{2}\times8 \\ r=4\text{ ft} \end{gathered}[/tex]Since the height is 12 ft, then
h = 12
Substitute r by 4 and h by 12 in the formula above to find the volume
[tex]\begin{gathered} V=3.14\times(4)^2\times(12) \\ V=3.14\times16\times12 \\ V=602.88ft^3 \end{gathered}[/tex]Round it to the nearest whole number
V = 603 cubic feet to the nearest whole number