Question 422080
Since the diameter is 4 ft, the radius is 4/2=2 ft. So r=2



{{{V=pi*r^2*h}}} Start with the volume of a cylinder formula.



{{{V=pi*(2)^2(40)}}} Plug in {{{r=2}}} and {{{h=40}}}.



{{{V=(3.14159265)(2)^2(40)}}} Replace {{{pi}}} with {{{3.14159265}}} (note: Use more digits of {{{pi}}} to get better accuracy).



{{{V=(3.14159265)(4)(40))}}} Square {{{2}}} to get {{{4}}}.



{{{V=502.654824}}} Multiply {{{3.14159265}}}, {{{4}}} and {{{40}}} to get {{{502.654824}}} (this value is approximate).



So the volume is approximately 502.654824 cubic ft.



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