Depends whether it's the radius or diameter that's 24ft. If
radius, circumference is 48pi or close to 150.8 ft; if it's
diameter then circ is 24pi=75.4 ft

It depends on what you mean by a 24 foot circle: around it (circumference) or across it (diameter)? If circumference, then volume = 201.7 cubic ft If diameter, then 452.4 cubic feet.