How much water does a container 18 inches in diameter and 30 inches high hold?

To calculate the volume of water a cylindrical container holds, you can use the formula ( V = \pi r^2 h ), where ( r ) is the radius and ( h ) is the height. The radius is half the diameter, so for an 18-inch diameter, the radius is 9 inches. Plugging in the values: ( V = \pi (9^2)(30) ) gives approximately 2,543 cubic inches, which is about 14.67 gallons of water.