Question: When is a successful shot worth three points?
About the article "Basketball", section "Rules and regulations".

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A three-point field goal (also known as a three-pointer, three, or trey) is a field goal in a basketball game made from beyond the three-point line, a designated arc surrounding the basket.
A successful attempt is worth three points, in contrast to the two points awarded for shots made inside the three-point line.
In 3x3, a formalized version of half-court basketball, shots from outside the arc are worth 2 points, with all other successful shots worth 1 point.
A three-point field goal is distinguished from a "three-point play" or an "and-1", which occurs when a shooter successfully scores a two-point basket while being fouled, and then makes the ensuing free throw.
If such a foul occurs on a successful three-point shot, the resulting free throw gives the player a chance to earn a four-point play.
If a player gets fouled while shooting a three-point shot but does not score they get three free throws.
In 3x3, a defensive foul on an unsuccessful shot from behind the arc results in two free throws.
Three-point field goal percentage is a measure of three-point shooting accuracy calculated by the ratio of three-point field goals made to three-point field goals attempted. 
Measurements and time limits discussed in this section often vary among tournaments and organizations; international and NBA rules are used in this section.
The object of the game is to outscore one's opponents by throwing the ball through the opponents' basket from above while preventing the opponents from doing so on their own.
An attempt to score in this way is called a shot.
A successful shot is worth two points, or three points if it is taken from beyond the three-point arc which is from the basket in international games and in NBA games.
A one-point shot can be earned when shooting from the foul line after a foul is made.
Scoring is achieved by passing the ball into the net at the opponent's end of the court for points, while preventing the opposing team from doing the same at one's own net.
The aim is to have outscored the opposing team when the game ends.
A successful score can be worth two points if the ball is thrown through the hoop without the offensive player touching the hoop.
Slam dunks are scored three points.
All shots outside three-point arc are worth three points as well.
In this sport four players from each team (out of an 8 or 9 player roster) may be on the court at one time.
Substitutions are unlimited and can be done during play as in the game of hockey.
Each team has a coach and additional staff which includes assistant coaches, managers, statisticians, doctors, etc.
The game is controlled by two referees and the table officials.
The table keeps track of the score, time, team possessions, fouls and the shot clock. 
In basketball, a three-point field goal (also known as a "three-pointer" or "3-pointer") is a field goal made from beyond the three-point line, a designated arc radiating from the basket.
A successful attempt is worth three points, in contrast to the two points awarded for shots made inside the three-point line.
The National Basketball Association's (NBA) three-point shooting leader is the player with the highest three-point field goal percentage in a given season.
The statistic was first recognized in the 1979–80 season when the three-point line was first implemented that season.
To qualify as a three-point shooting leader, the player must have at least 55 three-point field goals made.
This has been the entry criteria since the 1999–2000 season.
Craig Hodges, Steve Kerr and Jason Kapono have each led the league in three-point shooting for two seasons.
Kapono is the only player to do so in consecutive seasons.
Kyle Korver, who shot 53.6% from beyond the arc in the 2009–10 season, holds the all-time records for three-point field goal percentage. 
In American football, the winner is the team that has scored the most points at the end of the game.
There are multiple ways to score in a football game.
The touchdown, worth six points, is the most valuable scoring play in American football.
A touchdown is scored when a live ball is advanced into, caught in, or recovered in the end zone of the opposing team.
The scoring team then attempts a try or conversion, more commonly known as the point(s)-after-touchdown (PAT), which is a single scoring opportunity.
A PAT is attempted from the two- or three-yard line, depending on the level of play.
If scored by a placekick or dropkick through the goal posts, it is worth one point, and is typically called the extra point.
If it is scored by what would normally be a touchdown, it is called the two-point conversion and is worth two points.
No points are awarded on a failed extra point or two-point conversion attempt.
In general, the extra point is almost always successful in professional play and is slightly less successful at amateur levels, while the two-point conversion is a much riskier play with a higher probability of failure.
A field goal, worth three points, is scored when the ball is placekicked or dropkicked through the uprights and over the crossbars of the defense's goalposts.
After a PAT attempt or successful field goal the scoring team must kick the ball off to the other team.
A safety is worth two points and is scored by the defense.
It occurs when the ball carrier is tackled in his own end zone.
After a safety has been scored, the team that conceded the safety must return the ball to the scoring team via a free kick, which in professional football often resembles a punt.