NBA BasketballHere are some official NBA basketball rules if you think that you are cloudy on certain aspects of the sport. A NBA basketball free throw line must be 2 feet wide and fifteen feet from the face of the backboard. Many penalties and other NBA basketball rules can be hard to follow. One of the most uncommon penalties is a delay of game, which happens if the ball is touched before a throw in is completed, failing to pass the ball to a ref after the whistle has been blown, and if a defender crosses the boundary line before a ball is released on a throw in. Basketball players that hang on the rim, net or backboard will be fined 500 dollars for an unsportsmanlike foul. Basketball players can also be fined up to 35,000 dollars if they receive fighting fouls.