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.
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0.034127m
6 inches because the 12-inch softball would be the diameter.
centimeters
97.5 mm
well the circumference is 12 inches and Circumference = 2(pi)r.