12 inches
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0.034127m
28.74195 Cubic inches
well the circumference is 12 inches and Circumference = 2(pi)r.
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.
In most 10 and under age groups, the circumference is 11 inches. That would make the diameter 3.5 inches. From 12 and under until college softball, the circumference is 12 inches. That diameter would be 3.8 inches.