The size of a regulation volleyball depends on if it is used for indoor or beach volleyball. An indoor ball has the radius of about 21 centimeters, and a beach ball has a radius of about 21.7 centimeter.
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9 inches in diameter, 7.5-8.5 pounds/inch of pressure, about 14.5 pounds, full grain leather
A soccer ball is 27 to 28 inches in circumference. Circumference is pi times diameter, or 2 times pi times radius. Radius = circumference divided by (2 times pi).
There is no single size. Even the NBA "standard", size 9, has a radius between 12.05 and 12.50 cm.