Basketball court

The home court of the Minnesota Timberwolves of the National Basketball Association

In basketball, the basketball court is the playing surface, consisting of a rectangular floor with tiles at either end. In professional or organized basketball, especially when played indoors, it is usually made out of a wood, often maple, and highly polished. Outdoor surfaces are generally made from standard paving materials such as concrete or asphalt (i.e., blacktop/tarmac).

The object of the game is to shoot the ball through the hoop at either end of the court. When the game was first invented, actual peach baskets were used. Dr. James Naismith's original rules specified that "A goal shall be made when the ball is thrown or batted from the grounds into the basket and stays there, providing those defending the goal do not touch or disturb the goal." ^[1] However, because it proved to be inconvenient to continually retrieve the ball from the baskets, the baskets were soon replaced by metal hoops (usually with dangling netting attached to direct the ball straight down.) The hoops are attached to rectangular (or sometimes fanshaped) backboards made of either metal, fiberglass, acrylic, or tempered glass.

The basketball court comes in different shapes and sizes. In the N.B.A., the court is 94 feet by 50 ft (28.65 m by 15.24 m). Under International Basketball Federation (FIBA) rules,^[2] the court is slightly smaller, measuring exactly 28 m by 15 m (91'10.4" by 49'2.6"), although national federations are allowed to use smaller courts, as long as they are at least 26 m by 14 m (85'3.6" by 45'11.2"). A high school court is slightly smaller, at 84' by 50' and some elementary schools have courts measuring 74' x 42'. In amateur basketball, court sizes vary widely. The baskets are always 10' (3.05m) above the floor (except possibly in youth competition).

Diagram of basketball court and backboard

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  A diagram of an FIBA basketball court

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  Composite diagram of a basketball court with FIBA (top half only), NBA (both halves), and NCAA (men’s & women’s – bottom half only) markings

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  The backboard and basket

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  NCAA backboard and basket (2008)

Layout prescribed by the rules of the International Basketball Federation, the National Basketball Association, and the National Collegiate Athletic Association. (NBA)

Dimensions

Area		NBA		FIBA		WNBA		Men's NCAA[3]		Women's NCAA[3] and U.S. H.S.		U.S. junior H.S.
		Imperial	Metric	Imperial	Metric	Imperial	Metric	Imperial	Metric	Imperial	Metric	Imperial	Metric
Court length		94 ft	28.65 m	91.86 ft	28 m	Same as NBA				94 ft - NCAA, 84 ft HS	25.6 m	74 ft	22.56 m
Court width		50 ft	15.24 m	49.21 ft	15 m	Same as NBA						42 ft	12.8 m
Rim height		10 ft	3.05m	Same as NBA
Restricted area distance from the basket		4 ft	1.22 m	4.10 ft	1.25 m	Nonexistent
Center circle diameter		12 ft	3.66 m	11.81 ft	3.6 m	Same as NBA
3-point line distance from the basket		23.75 ft 22 ft Sides	7.24 m 6.70 m*	20.5 ft 22.15 ft (from Oct. 2010)	6.25 m 6.75 m ,base line 6.60m from Oct. 2010)	20.5 ft	6.25 m	20.75 ft	6.32 m	19.75 ft	6.01 m	Same as high school
Key (shaded lane or restricted area) width	FT line	16 ft	4.88 m	11.81 ft	3.6 m	Same as NBA		12 ft	3.66 m	Same as NCAA
	End line			19.69 ft	5 m
Free-throw line distance from the backboard		15 ft	4.57 m	15.09 ft	4.6 m	Same as NBA

* The NBA three-point line is 3 ft (0.91 m) from the sideline in a zone starting at the baseline and ending when it crosses the 23 ft 9 in (7.24 m) arc. The 22 ft (6.7 m) measurement applies only at a point where a line parallel to the baseline intersects the long axis of the court and the center of the basket.

Sections of the basketball court

Center circle

The only two players permitted to enter this area prior to the tipoff are the players contesting the jump ball (usually but not always centers). They both have to jump when the referee throws the ball in the air to attempt to push the ball into the hands of a player of their own team.

Three-point line

The three-point line is the line that separates the two-point area from the three-point area; any shot converted beyond this line counts as three points. If the shooting player steps on the line, it is counted as two points only. Any foul made in the act of shooting beyond the three-point line would give the player three free throws if the shot doesn't go in, and one if it does.

The distance to the three-point from the center of the basket varies depending on the level or league, and has changed several times. These are the current distances, with the league or level using each distance:

19.75 feet (6.02 m): NCAA (women), high school

20.5 feet (6.2 m): International, WNBA

20.75 feet (6.32 m): NCAA (men)

22 feet (6.7 m) to 23.75 feet (7.24 m): NBA

The NBA adopted the three-point line at the start of the 1979-80 season. This is of variable distance, ranging from 22 feet (6.7 m) in the corners to 23.75 feet (7.24 m) behind the top of the key. During the 1994–95, 1995–96, and 1996-97 seasons, the NBA attempted to address decreased scoring by shortening the overall distance of the line to a uniform 22 feet (6.7 m) around the basket. It was moved back to its original distance after the 1996-97 season.

In college basketball as well as in most high school associations in the United States, the distance is 19.75 feet. On May 26, 2007, the NCAA playing rules committee agreed to move the three-point line back one foot to 20.75 feet for the men. This rule went into effect for the 2008-2009 season. The three-point line for women (NCAA) remains at 19.75 feet.

The international distance, used in most countries outside the United States and in FIBA competition, is currently 20.5 feet (6.25 m). The same goes for the WNBA.

Perimeter

The perimeter is defined as the areas that are farthest to the basket but outside of the free throw lane and inside the three-point line. Shots converted in this area are called "perimeter shots" or "medium-range shots". If a player's foot is on the three-point line, it could also be considered a "perimeter shot".

Low post area

The low post is defined as the areas that are closest to the basket but outside of the free throw lane.^[4] This area is fundamental strategy in basketball. Skilled low post players can score many points per game without ever taking a jump shot.

Key

The key or shaded lane refers to the frequently painted area beneath the basket; for NBA, it is 16 feet (4.9 m) wide, for the NCAA it is 12 feet (3.7 m) wide; for both instances it is 15 feet (4.6 m) from the backboard. At the top of the rectangle is the free-throw line, behind which players shoot uncontested shots when they're fouled in the act of shooting or any other penalty. A circle is drawn beyond the free-throw line with a 6 feet (1.8 m) radius; this is used for jump ball instances similarly done at the center circle. There are two 6 in hashes, 3 ft from the free throw line. These marks serve no purpose, though NBA Rule 1 (g) requries them to be drawn.

For FIBA tournaments, since October 2010 the key has been a rectangle 4.9 m wide and 5.8 m long. Previously it was a trapezoid 3.7 meters (12 ft) wide at the free-throw line and 6 meters (19 feet and 6.25 inches) at the end line.

The key is primarily used to prevent players from staying beneath the basket of the opponents' team for long periods (maximum 3 seconds).

Restricted area arc

The restricted area arc is an arc 4 feet (1.22 m) from the center of the basket. With some exceptions, defending players can't force offensive fouls in this area.

Other lines

At NBA floors, two lines are drawn at the end lines near the key - the area directly behind the lines designates the spot where teams on the offensive can inbound the ball.

A similar line parallel to the verticals of the three-point line in NBA floors serves with the same purpose; also this line demarcates the farthest extent a coach (aside from the sidelines) can stay. Directly behind this area is the team bench.

On the half-court line at NBA floors there are 2 lines extending outside the playing court designating the place where substitutes wait before they can enter the playing court; directly behind this area are the various off-court officials such as the timekeeper and reserve referee.

Future changes

On April 26, 2008, FIBA announced several major rules changes involving the court markings. These changes will take effect for major international competitions on October 1, 2010, after that year's World Championships for men and women, and become mandatory for other competitions on October 1, 2012 (although national federations can adopt the new markings before 2012). The changes will be:^[5]

• The shape of the key will the change from a trapezoid to a rectangle as it is in the NBA, with NBA dimensions.
• The three-point line will move back to 6.75 metres (22 ft 1.7 in) from the current 6.25 metres (20 ft 6.1 in), compared to 23 ft 9 in (7.24 m) for the NBA at the top of the arc.
• FIBA will adopt the NBA's restricted area arc with a marginally wider radius of 1.25 metres (4 ft 1.2 in).

See also

• Assembly hall
• List of indoor arenas in the United States#Major college indoor arenas

References

1. ^ http://www.hoophall.com/history/original_13rules.htm
2. ^ "Official Basketball Rules 2006" (pdf). International Basketball Federation. 2006. http://www.fiba.com/asp_includes/download.asp?file_id=328. Retrieved 2007-04-14. 
3. ^ ^{a b} "NCAA Court and Equipment Rules" (pdf). 2010. http://web1.ncaa.org/web_files/rules/fielddiagrams/bball.pdf. Retrieved 2010-04-07. 
4. ^ Basketball Glossary Terms, Definition, Lane violation, Low post
5. ^ "The FIBA Central Board approves historic rule changes" (Press release). FIBA. 2008-04-26. http://www.fiba.com/pages/eng/fc/news/lateNews/p/newsid/24352/arti.html. Retrieved 2008-04-28. 

External links

• Information on Building, Choosing, Maintaining a Basketball Court
• FIBA Central Board (2010-04-17). "Official Basketball Rules 2010: Basketball Equipment" (pdf). International Basketball Federation. http://www.fiba.com/pages/mod/v3/util/downMana.asp?fileID=1258. Retrieved 2010-07-15.