The exact volume of the sphere is 972π cubic inches
How to determine the exact volume
From the question, we have the following parameters that can be used in our computation:
Diameter = 18 inches
This means that
Radius, r = 9 inches
The exact volume is calculated using
Volume = 4/3πr³
Substitute the known values into the equation
Volume = 4/3π * 9³
Evaluate
Volume = 972π
Hence, the exact volume of the sphere is 972π cubic inches