what is nba regulation size basketball
The inside diameter of a regulation rim is 18 inches. A regulation NBA basketball is between 29 1/2 to 29 7/8 inches in circumference, equating to a diameter of 9.39 to 9.51 i â¦ nches, or an average of 9.45 inches.BA Basketball Courts-the 3 point arc is 22 feet to the center of the rim on the sides with a straight line extending out 16 feet 9 inches from the baseline. Past those points the line extends out 23 feet 9 inches from the center of the rim. Mens College Basketball Courts-the 3 point arc is 20 feet 9 inches.