The trunk of a tree is approximately cylindrical in shape
and has a diameter of 1 m when the height is 15 m.
If the radius is increasing at 3mm/year (0.003 m/year)
and the height is increasing at 0.4 m/year,
find the rate of increase of the volume of the trunk. . . . . when?
The volume of a cylinder is: .
After years: .