* two identical flat ends that are circular or elliptical
* and one curved side.
It has the same crosssection from one end to the other.
Cylindrical Tank  

Where,
C  Capacity
Example:
Calculate the storage capacity of a cylindrical tank for the given details.
Diameter: 25 inches
Length: 20 inches
Solution:
Apply Formula:
C (cubic inches) = ( ( Length * 3.1415 * Diameter2) / 4)
C (cubic inches) = ((20*3.14 * 252)/4)
C (cubic inches) = ((62.8 * 625)/4)
C (cubic inches) = 39250/4
C (cubic inches) = 9817.1875
C (Gallons) = C (cubic inches) / 231
C (Gallons) = 9817.1875 /231
C (Gallons) = 42.49864718614719