The volume of a cylinder is 
Explanation:
Given that the diameter of the cylinder is 10 inches.
The radius of the cylinder is given by


Thus, the radius is 5 inches.
Also, given that the height is three times the radius.
Thus, we have,



Thus, the height is 15 inches.
The volume of the cylinder is given by

Substituting the values, we get,



Using the calculator, the value of pi is determined and multiplied with 375.
Hence, we have,

Thus, the volume of the cylinder is 