Wikipedia says the circumference of a fast-pitch softball for international play is 12 in. The formula for circumference is 2*pi*radius. So to find the radius, divide the circumference by 2*pi. The answer then is: 1.9 in.
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6 inches because the 12-inch softball would be the diameter.
well the circumference is 12 inches and Circumference = 2(pi)r.
28.74195 Cubic inches
0.034127m
If the diameter is 6 inches, then the radius is 3 inches.