In the US, a billiards ball or pool ball is 2.25 inches in diameter. This is 1.125 for its radius. The only exception is the oversize cue ball, which is 2.375 inches in diameter.
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The radius is half the diameter of a ball (or sphere), so if diameter is 7.91 units the radius is 3.955 units.
Volume of the beach ball: 4/3*pi*radius^3
yes, the ball is a sphere with a diameter and a radius-which is geometry
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).
First we have to find the radius because the diameter is twice the radius: 4/3*pi*radius3 = 28 radius = 1.883749459 (worked out by making the radius the subject of the formula) diameter = 3.767498918 or 3.77 inches to 2 d.p.