
In basketball, the term cylinder refers to an imaginary cylinder surrounding a player, extending from the floor to as high as they can jump or extend their arms and body. This cylinder defines the legal space that a player may occupy and is used to determine violations such as basket interference and goaltending. While a basketball itself is not a cylinder, the concept of an imaginary cylinder is crucial in enforcing rules regarding player movement, contact, and scoring.
| Characteristics | Values |
|---|---|
| Definition of a cylinder in basketball | An imaginary cylinder surrounding a player that extends from the floor to as high as they can jump or extend their arms and body. |
| Who the cylinder rule applies to | Offensive and defensive players |
| When the cylinder rule applies | When a player is attempting a normal basketball play, which includes shooting, passing, dribbling, or pivoting. |
| Violation of the cylinder rule | When a defensive player invades the cylinder of an offensive player and causes illegal contact. |
| Basket interference | When a player touches the ball or any part of the basket (including the net) while the ball is on the rim of the basket or entirely within the cylinder extending upwards from the rim. |
| Goaltending | When the ball is touched while "in the cylinder", i.e., when the entire ball is within the vertical cylinder formed by the rim. |
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What You'll Learn

Basketball's 'cylinder rule'
The "cylinder rule" in basketball is a rule that defines the personal space of a player on the court. It is an imaginary cylinder that surrounds a player, extending from the floor to as high as they can jump or extend their arms and body. The diameter of the cylinder is defined by the player's stance, with the front of the cylinder marked by the hands/arms (bent at the elbow), the back by the buttocks, and the sides by the legs. This cylinder establishes a player's legal space on the court, and any violation of this space by another player can result in a foul being called.
The cylinder rule helps protect offensive players by ensuring they have enough space to make a normal basketball play, such as shooting, passing, dribbling, or pivoting. Defensive players are not allowed to invade the cylinder of an offensive player with the ball and cause illegal contact during a normal basketball play. If a defensive player enters the cylinder and makes contact with the offensive player, it is considered a foul, and the defensive player is penalised.
The cylinder rule also applies to the area above the basket, known as the "basket cylinder." This imaginary cylinder extends vertically upwards from the rim. If an offensive player touches the ball while any part of it is within this cylinder, it is called a basket interference violation. Similarly, if a defensive player touches the ball within the basket cylinder, it is considered goaltending, resulting in points being awarded to the shooting team.
The interpretation and enforcement of the cylinder rule can sometimes be subjective, and there may be debates about whether a player's cylinder has been violated or if the ball is fully within the basket cylinder. The rule aims to promote fair play and prevent unnecessary contact between players, ensuring that offensive players have the necessary space to execute their plays without obstruction from defenders.
While the cylinder rule itself does not refer to the shape of the basketball, the ball's interaction with the basket cylinder is an important aspect of the game. The cylinder rule helps define the legal boundaries of play and ensures that players respect each other's personal space on the court.
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'In the cylinder'
The "cylinder" in basketball is an imaginary vertical cylinder that surrounds a player and defines the legal space that they may occupy. This cylinder extends from the floor to as high as the player can jump or extend their arms and body. The diameter of the cylinder is determined by the player's stance, with the front defined by the hands/arms (bent at the elbow) and the sides and back by the legs and buttocks.
The cylinder rule came into effect for the 2016-2017 season and is important for both offensive and defensive players. For offensive players, the cylinder provides the space to make a normal basketball play, such as shooting, passing, dribbling, or pivoting, without illegal contact from defenders. If a defender invades the cylinder of an offensive player with the ball and causes illegal contact, it is a foul.
For defensive players, it is important to be aware of the cylinder of the offensive player to avoid committing a foul. The defensive player must not invade the vertical space of the offensive player and make illegal contact when the offensive player is attempting a normal basketball play.
Additionally, the cylinder is also relevant in terms of basket interference. It is a violation for any player to touch the ball when it is within the cylinder extending upwards from the rim. This includes touching the ball when it is on the rim, reaching up through the basket from below, or pulling down on the rim to make contact with the ball.
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'Cylinder principle'
The cylinder principle in basketball is a rule that came into effect ahead of the 2016-17 season. It defines the space that a player may legally occupy on the court. This space is an imaginary cylinder surrounding the player, extending from the floor to as high as the player can jump or extend their arms. The diameter of the cylinder is defined by the player's body position, with the front of the cylinder defined by the hands/arms (with elbows bent), the back by the buttocks, and the sides by the legs.
The cylinder principle is important for defining legal and illegal contact between players. For example, the defensive player must not invade the cylinder of an offensive player with the ball and cause illegal contact when the offensive player is attempting a normal basketball play within their cylinder. Normal basketball plays include shooting, passing, dribbling, or pivoting. If a defensive player invades the cylinder and contact occurs, they are responsible for the contact and a foul will be called.
The cylinder principle also applies to the ball itself. If the ball is touched by a player when it is within the cylinder above the basket ring, it is called a basket interference violation. This cylinder is defined as the vertical space extending upwards from the rim, with the radius of the cylinder being the radius of the rim plus the radius of the ball.
In summary, the cylinder principle in basketball defines the legal space that a player may occupy, and it is used to determine whether contact between players is legal or illegal. It also applies to the ball, with certain violations called if the ball is touched while within the cylinder above the basket ring.
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'Cylinder violation'
The cylinder in basketball is an imaginary vertical area surrounding a player, extending from the floor to as high as they can jump or extend their arms and body. The diameter of the cylinder is defined by the player's body, from the hands/arms in front (with elbows bent), to the buttocks at the back, and the legs on the sides.
The cylinder rule, which came into effect in the 2016-17 season, dictates that the defensive player may not enter the cylinder of the offensive player with the ball and cause illegal contact when the offensive player is attempting a normal basketball play. This includes shooting, passing, dribbling, or pivoting. If the defensive player invades the cylinder and contact occurs, it is a foul.
A cylinder violation can also occur when a player touches the ball or basket during play. This is called basket interference. Basket interference is a violation of:
- Touching the ball or any part of the basket (including the net) when the ball is on the rim of the basket
- Touching the ball when it is entirely within the cylinder extending upwards from the rim
- Reaching up through the basket from below and touching the ball, whether inside or outside the cylinder
- Pulling down on the rim of the basket so that it contacts the ball before returning to its original position, or during a shot attempt
The only exception to the basket interference rule is when a player dunks the ball. In this case, they may maintain contact with the ball into the cylinder or grab the rim momentarily without penalty.
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'Cylinder interpretation'
In basketball, the cylinder interpretation is a rule that came into effect ahead of the 2016-17 season. It defines the space that a player may legally occupy during a game. This space is in the form of an imaginary cylinder surrounding the player, extending from the floor to as high as the player can jump or extend their arms and body. The diameter of the cylinder is defined by the player's body position, typically not extending beyond the hands/arms in front (with arms bent at the elbow), the buttocks at the back, and the legs on the sides.
The cylinder rule is particularly relevant when it comes to fouls and violations. For example, a defensive player must not invade the cylinder of an offensive player with the ball and cause illegal contact when the offensive player is attempting a normal basketball play, such as shooting, passing, dribbling, or pivoting. If the defensive player enters the cylinder and contact occurs, they will be called for a foul. Similarly, an offensive player must not spread their legs or arms outside their cylinder to create more space or gain an advantage, as this can result in illegal contact with the defensive player.
The cylinder interpretation also applies to the ball itself during a shot attempt. Basket interference occurs when a player touches the ball when it is entirely within the cylinder extending upwards from the rim. This cylinder is defined as the vertical space above the rim, with its diameter being roughly the radius of the rim plus the radius of the ball. Goaltending, a specific type of basket interference, occurs when the ball is touched while in this cylinder during a shot attempt, resulting in points being awarded to the shooting team.
In summary, the cylinder interpretation in basketball establishes an imaginary cylinder around each player and the basket rim, defining the legal space they can occupy and how contact and violations are determined. This rule promotes fair play and helps prevent advantages gained through illegal contact or interference with the ball during a shot.
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Frequently asked questions
The cylinder in basketball refers to an imaginary vertical cylinder that extends from the floor to as far above the player as they can jump or extend their arms and body.
The diameter of the cylinder is defined by the player's body, extending from the hands/arms in front (with arms bent at the elbow), to the buttocks at the back, and the legs on the sides.
The cylinder rule states that the defensive player may not enter the cylinder of the offensive player with the ball and cause illegal contact when the offensive player is attempting a normal basketball play within their cylinder.
Normal basketball plays include shooting, passing, dribbling, or pivoting.
If a player touches the ball while it is within the cylinder, it is considered basket interference and is a violation.

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