The formula for circumference is C = pi x diameter (or pi x 2r, with r being the radius.) Use 3.14 to approximate pi. C = 3.14 x 24 = about 75.36 inches.
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A circle with a radius of 24 inches has a circumference of 150.8 inches.
24 divided by pi = 7.639437268 inches
Circumference = 24*pi = 75.398 inches to 3 dp
If 24 inch diameter then the C=75.36, if 24 inch radius then the C=150.72
A circumference of 75.4 units.