The answer depends on what 24 pi (not pie!) refers to: radius, diameter, something else.
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A circumference of 75.4 units.
Circumference = 2*pi*radius = 150.80 units.
If the radius of the circle is 1, the area is pi. (3.14159 square units) The circumference is twice that. (6.28318 units)
Circumference is pi times diameter. If the radius is 24, the diameter (twice the radius) is 48, making the circumference 48pi, or approximately 150.72 units.
Circumference of a circle = 2*pi*radius or diameter*pi Its diameter = circumference/pi