If you cut the ball in half, then find the middle, it would be the distance from the middle to the edge.
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Volume of the beach ball: 4/3*pi*radius^3
10 inches
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.
4.325
The radius is half the diameter of a ball (or sphere), so if diameter is 7.91 units the radius is 3.955 units.