Submerge the ball, if it's small enough, into a graduated cylinder and measure the volume change. Take that number and divide it by 4, then divide it by 3.1415, then multiply it by three, then take the cube root of it, then multiply it by 2. There's your diameter!
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A vernier caliper should be used to measure the diameter of a steel ball.
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.
Internal diameter.
-- Measure the diameter of the ball (the fattest dimension).-- Take the "cube" of that number. (itself x itself x itself)-- Multiply the result by 0.5236The answer is the volume of the ball in cubic-(same unit as the diameter of the ball).Note: Where the 0.5236 came from ... it's (4/3 pi) x (1/2)3
The radius of a circle is half the diameter.