An NBA game court is 94 feet long and 50 feet wide, divided in half by a midcourt line. Each half is a mirror image of the other. This diagram shows some of the key markings and areas of an NBA basketball court.

Backboard: The basket ring is attached to the backboard, which measures six feet horizontally and 3.5 feet vertically. On the backboard, a two-inch white rectangle is centred behind the basket ring, with outside dimensions of 24 inches horizontally and 18 inches vertically.

Backcourt: A team's defensive half of the court.

Basket: The ring and net through which the ball must pass in order to score a field goal. The basket ring is 10 feet above the floor and measures 18 inches in diameter.

Basketball: The game ball, which is nine inches in diameter, with between 7.5 and 8.5 pounds pressure.

Baseline: The line at each end of the court, also known as the endline. The middle of the basket is five feet three inches from the baseline.

Centre Circle: A circle 12 feet in diameter, located in the centre of the midcourt line. The opening tipoff takes place at the centre circle.

Free Throw Line: A marking at the top of the lane, behind which players must stand when shooting free throws. The free throw line is 15 feet from the backboard.

Frontcourt: A team's offensive half of the court.

Lane: A painted area of the court between the baseline and free throw line. Also called the key because in the early years it was key-shaped. It was twice widened to its present rectangular shape and now is 16 feet wide.

Midcourt Line: Also called the division line, the midcourt line divides the court in half.

Three-Point Line: An arc that is 23 feet nine inches at the top and 22 feet on the baselines, measured from the middle of the basket. A field goal taken from beyond this line is worth three points.