12 inch
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Well, darling, if a circle has a circumference of 24 inches, we can use the formula C = 2πr to find the radius. Just plug in 24 for C and solve for r. You'll find that the radius of this sassy circle is 3.82 inches.
6 inch
2 inches. the radius is half of the diameter
Circumference = 2 x pi x radius = 24 pi 2 x radius = 24 ; radius = 12 units
It is customary to call a circle a 38 inch circle if its diameter is 38 inches. If that is the case, the radius = diameter/2 = 19 inches.