ANSWER:
The height of the cylinder is 6 ft approximately.
SOLUTION:
Given, the volume of a right cylinder is 155.4

And, radius of the cylinder is 3 ft.
We need to find the height of cylinder.
We know that, volume of the cylinder = area of cross section
height
Here, cross section is circular. Hence we can rewrite above formula as,
volume = area of circle
height


Hence, the height of the cylinder is 6 ft approximately.