We have that the volume of a cylinder is given by the following equation:
[tex]V=\pi\cdot r^2\cdot h[/tex]h is tall and r the radius, the radius is:
[tex]\begin{gathered} r=\frac{d}{2}=\frac{26}{2}=13 \\ \end{gathered}[/tex]replacing:
[tex]\begin{gathered} V=3.14\cdot(13)^2\cdot44 \\ V=23349.04 \end{gathered}[/tex]The volumen of the cylinder is 23349.04 cubic meters