Answer:
The radius of these cylinders is approximately 1 foot.
Step-by-step explanation:
According to this graph, the volume of the cylinder is directly proportional to its height, that is, radius remains constant. The expression of direct proportionality:

(1)
Where:
- Volume of the cylinder, in cubic feet.
- Height of the cylinder, in feet.
- Proportionality constant, in square feet.
Besides, the proportionality constant is described by this expression:
(2)
Where
is the radius of the cylinder, in feet.
If we know that
and
, then the radius of the cylinder is:




The radius of these cylinders is approximately 1 foot.