R squared times pi times height 12 times 12 times pi times 20 144 times pi times 20 which is around 9048 meters squared. V_horizontal_cylinder p radius² length p diameter2² length. For cylindrical tanks determining the internal volume is as easy as squaring the radius of the tank and multiplying first by pi then by the height.
OR US gallons volume results.
For example lets calculate the volume of a rectangular tank that is 20 long 12 wide and 10 high. Please enter data for Tank Radius radius is 12 of diameter and side water depth. V tank pr2h. Start by calculating the volume in cubic inches.