formula of the volume of a prism = (base area)(height) formula of the volume of a pyramid = (1/3)(base area)(height) therefore, to convert the volume of a prism to that of a pyramid, just divide it...
sigh..really?? gallons is a volume in ftt. thus you cannot convert an AREA into a VOLUME, because ft2 does not equal ft3!! you can convert the volume of a cube into gallons though...