If the circle is 5 feet around the circumference then there are 5 linear feet in the circumference. If you are asking what is the circumference of a circle with a 5 foot diameter then the answer is Pi x d

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.

The area of a circle is PI times the radius of the circle squared. The radius of a one foot diameter circle it 1/2 or .5 feet. .5 squared is .25 PI is 3.1416 3.1416 times .25 = .79 square feet So, there are about .8 square feet in a 1 foot diameter circle.