The volume of the cylinder formula is 
The values are given by diameter is 2.6 m and height is 3.5 m.
\The radius is half of its diameter, So,
.

(Substitute 3.14 for
, 1.3 for r and 3.5 for h)
(Evaluate power
)
(Multiply:
)
(Multiply:
)
The volume of the cylinder is
.