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If the diameter of the circle is 24 feet, the radius is half that, or 12 feet. If the circumference of the circle is 24 feet, the radius is 24 divided by 2 divided by pi, or 3.82 feet.
The radius of a circle is always half of the distance of the diameter. If you have a 24 mm diameter - then the radius would be 12 mm.
radius is half diameter r = 1/2 x 24 = 12
Radius = diameter/2 = 24 inches
Circumference = 2*pi*radius = 150.80 units.