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Circumference = pi*d, so Circumference = 16*pi
16 inch circumference: radius = diameter / 2. diameter = circumference/pi, so radius = 16 in / 2 / pi = (8/pi) inches [approx 2.55 inches] 16 inch diameter: radius = diameter / 2 = 16 in / 2 = 8 inches.
pi*diameter = 16 inches Divide both sides by pi to find the diameter: diameter = 5.092958179 or 5 inches to the nearest inch.
5.1 inches. I rounded to the nearest tenth.
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).