Answer:
[tex]135\pi\ ft^3[/tex]
Step-by-step explanation:
we know that
The volume of a cylinder (concrete column) is equal to
[tex]V=\pi r^{2}h[/tex]
we have
[tex]r=3\ ft\\h=15\ ft[/tex]
substitute
[tex]V=\pi (3)^{2}(15)[/tex]
[tex]V=135\pi\ ft^3[/tex]