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 that is 16 mm in diameter is 50.27 mm
2.63 inches in diameter
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.
The Golf Ball has a diameter not less than 1.680 in (42.67 mm).
9 inches (230 mm)
The diameter of a pool ball is 2 and 1/4 inch diameter. The radius of a pool ball is 1 and 1/8 inches. The radius is one half of the diameter.
Surface area of the ball = 4*pi*342 = 4624*pi square mm
The maximum diameter of a golf ball is 1.680 inches. In professional golf a ball can not weigh more than 1.620 ounces.
The ball used in table tennis has a diameter of d = 40 mm. Some time ago it was 38 mm. 40mm=4cm, 4cm/(2.54cm/in)=1.575 (rounded) inches
Circumference of pool ball: 2*pi = 6.283 inches rounded to 3 decimal places
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 55 mm is: 172.8 mm