(1) NBA standard court drawing method.

1. The size of the NBA court is 28.65 meters long and 15.24 meters wide.

The long boundary of the basketball court is called the edge line, and the boundary of the short side is called the end line (aka the bottom line).

2. The two ends of the pitch are marked with rectangular paint areas, which are 5.79 meters long and 4.88 meters wide.

3. The two ends of the court are marked with 3 points, and the drawing method is: two lines parallel to the sideline are drawn from the bottom line, each 0.91 meters away from the sideline, and the arc with the center point of the basket as the center of the circle and the radius of 7.24 meters intersects.

(Thus, the three-point line is divided into two parts, one 6.71 meters from the center of the basket and the other 7.24 meters from the center of the basket.) ）

4. Free throw area: It is the paint area plus the semi-circle area drawn outside the paint area with the midpoint of the free throw line as the center and the radius of 1.80m, which is the area where the free throw is executed.

5. Take the midpoint of the middle line as the center of the circle, draw a small circle with a radius of 0.61 meters, and draw a large circle with a radius of 1.83 meters, which are two jumping circles.

6. The basket is 3.05 meters away from the floor, and the distance between the two vertical sides of the rebound is equal;

7. The size of the rebound is: thickness 0.03 meters, width 1.80 meters, vertical height 1.05 meters.

8. The lower edge of the rebound is 2.90 meters from the ground, and the upper edge of the rebound is 3.95 meters from the ground. ，

9. The nearest point of the rebound surface from the inner edge of the hoop is 0.15 meters, the inner diameter of the hoop is 0.45 meters, and the maximum diameter of the hoop is 0.02 meters.

10. The distance between the center of the basket and the sideline is 1.58 meters, (1.2 + 0.15 + 0.225 = 1.575 meters)

11. The distance between the center of the basket and the free throw line is 4.2 meters, (5.79-1.575=4.215 meters).

12. The distance from the top of the arc to the sideline of the three-point line is 7.37 meters, (5.79 + 1.575 = 7.365 meters).

13. Under the basket, the center of the basket is the center of the circle, and the semicircle with a radius of 1.2 meters is called the reasonable collision area.

14. On the basketball court, there are a total of 8 tee points.

4 of them are located on both sides of the paint area, 4 meters from the sideline, and extend 0.91 meters into the court, which is the baseline service point;

The other four are located on the sideline, 8.53 meters from the end line, and extend 0.91 meters into the court, which is the sideline tee.

Using a simple trigonometric formula, a series of data can be deduced, as shown below.

The baseline tee, 4 meters from the center of the two baskets, is 28 meters.

The sideline tee, 10 meters from the center of the two hoops, is 20 meters.

15. Sideline serve, a little harsh, fixed-point serve, not traversal.

16. The bottom line serve, which is a little freer, can move half a meter left and right.

(2) Penalty position.

1. Chamberlain area: From both ends of the free throw line to the paint area, two straight lines parallel to the change of direction are drawn out, and two strips with a horizontal width of 0.64 meters and a vertical length of 5.79 meters are divided on both sides of the paint area, which is the Chamberlain area.

2. The free throw position is the three free throw positions in the Chamberlain area.

3. First position: a small box between 1.8 meters and 2.65 meters from the end line, 0.64 meters wide and 0.85 meters long;

4. Neutral Zone: A small box between 2.65 meters and 3.05 meters from the end line, 0.64 meters wide and 0.4 meters long;

5. Second position: a small square between 3 meters and 3.85 meters from the end line, 0.64 meters wide and 0.85 meters long;

6. Third station: a small square between 3.9 meters and 4.75 meters from the end line, 0.64 meters wide and 0.85 meters long;

(3) Reasonable collision areas.

In the NBA court, the center of the basket is the center of the basket, and the semicircle with a radius of 4 feet (1.2 meters) is called the reasonable collision zone.

Standing within the arc, a defensive foul may be awarded as long as the defender makes physical contact with the offensive player.

Outside the line, the defender can take a position in advance, and if the offensive player touches the defender with his body, the attacking player will be judged to hit someone. In a reasonable collision zone, when the opponent is attacking, the defender will not be whistled for a foul if he jumps, and if he does not jump, he will be whistled for a defensive foul.

(4) History of three-point line changes.

In the 79-80 season, on September 15, 1979, the NBA league decided to draw a semicircular arc with a sideline 6.71 meters from the basket and a top arc of 7.25 meters from the basket to the league's regular season court. Since then, a rainbow-like arc has revolutionized the NBA.

In previous NBA games, except for a two-point shot that was a one-point shot, there were no three-point shots at all.

The top five players on the three-point shooting list in the '93-94 season averaged 165 shots each, with a peak of just 292.

In the 94-95 season, the NBA shortened the distance to the three-point line to 6.70 meters, so many players flocked to the three-point line, and the top five players on the three-point shooting list this season averaged 258 shots per person, with the highest reaching 425.

This kind of situation where everyone can shoot three-pointers is difficult to reflect a player's long-range shooting ability.

In the '97-98 season, the NBA moved the three-point line back to its original 7.25 meters.

(4) The history of the change of the paint area.

Before the start of the '51-'52 season, the NBA decided to move the distance from the free throw line from 6 feet to 12 feet from the basket in order to curb the terrifying ability of George McCan, the first super center in NBA history.

Before the start of the '61-'62 season, the NBA again moved the free-throw line to 16 feet in an effort to contain Chamberlain. Thus was born the Chamberlain area.

(5) The Chamberlain Rule (a rule set by the NBA to limit Chamberlain).

1. Expand the paint area.

2. The baseline ball in the front court is not allowed to be higher than the top edge of the rebound.

3. When taking free throws, the free throw line is not allowed to jump off and dunk.

4. If the defending team commits a foul on a player who is not on the ball and is not prepared to possession 2 minutes before the end of the game, the attacking team can retain the ball after the free throws (1 or 2).

Rule 2 is explained below.

The frontcourt serves the baseline ball, once it is higher than the rebound, Chamberlain jumps up and catches the ball, and he can easily complete the air relay, crazy scoring, and make the game meaningless.

Rule 3 is explained below.

Chamberlain made poor free throws, and in order to improve his shooting percentage, he jumped straight from the free throw line to dunk,......。 The Los Angeles Times headline of February 12, 1989, was devoted to the incident.

As a result, Chamberlain had to change to "urinal free throws".

Regarding the free-throw line dunk, Chamberlain had this to say:

"That's how I played at the free-throw line: since I couldn't shoot beyond the top of the arc of the free throw zone, I would step back and dunk right from behind the free throw line, and they would declare me ...... illegal when I made free throws."

Rule 4 is explained below.

Because Chamberlain changed the way he made free throws, his shooting percentage was not high, and after the free throws, the ball was rotated, so it created a spectacle on the court.

At the end of the game, the opponent began to chase Chamberlain, who was without the ball, to foul Chamberlain in order to seize the players and gain time to attack; And Chamberlain, on the other hand, could only dodge the opponents who chased him for fouls like a rugby player.