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The radius would be 10 inches. Not sure about a radious, though.
The outer radius is 20/2 = 10 inches
10 inches
Volume = pi*r2*h = 282.7433 cubic inches
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).