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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.
Surface area of the ball = 4*pi*342 = 4624*pi square mm
The standard tennis ball have a diameter between 65.41 mm and 68.58 mm and they have 56.7 g to 58.5 g of weight. They are made in a stitchless manner.
approx. 6.28 in.
The circumference of a circle with a diameter of 13 mm is: 40.84 mm