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pi
The diameter is 1.68 inches or greater. The circumference can be found from ordinary principles of geometry. The formula for a the circumference is: C = πd So the circumference of a golf ball would be 5.2779 (to 4 decimal places)
circumference = 5*pi = 15.70796327 or 15.708 cm rounded to 3 d.p.
What is a "8 inch ball" ? Is 8 inches the diameter ? Then its diameter is 8 inches. Is 8 inches the radius ? Then its diameter is 16 inches. Is 8 inches the circumference ? Then its diameter is about 2.546 inches (rounded).
Let's assume that your golf ball is 1.680 inches in diameter - the smallest size golf ball allowed in certain golfing associations. Then we know that the circumference of the golf ball will be the distance it would roll in one complete rotation. Circumference = pi * diameter Circumference = 3.14 * 1.680 in Circumference = 5.2752 inches = the distance that this particular golf ball would roll