Given:
Height of the cylinder = 21 ft
Dimeter of the cylinder = 10 ft
To find:
The volume of the cylinder.
Solution:
We have,
Dimeter of the cylinder = 10 ft
So, radius is half of diameter, i.e., 5 ft.
Volume of the cylinder is

Where, r is the radius and h is the height.
Putting
, r=5 and h=21, we get



Therefore, the volume of the cylinder is 1648.5 cubic ft.