The volume of each of the Corinthian columns is approximately 3,768 ft³.
The area of a circle is found with the formula. πr². r is the Radius, but you have the diameter. Divide the diameter by two and the radius is found to be 4. Now, 4² is 4 times 4, or 16. now your formula is simplified to π times 16. 3.14 is pi, 3.14 times 16 is 50.24. The area of the base is 50.24 ft². The height is 75. The volume need you to multiply the area of the base by the height of the column. That's 75 times 50.24. The answer is 3,768 feet².
Please correct me if I'm wrong anywhere.