Three-point field goal percentage
A three-point field goal (also called a three-pointer) 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 field goals made within the three-point line and the one point for each made free throw.
The distance from the basket to the three-point line varies by competition level: in the National Basketball Association (NBA) the arc is 23 feet 9 inches (7.24 m) from the basket; in FIBA and the WNBA (the latter uses FIBA's three-point line standard) the arc is 6.75 metres or 22 feet 1 3⁄4 inches from the basket; and in the National Collegiate Athletic Association (NCAA) the arc is 20 feet 9 inches (6.32 m) from the basket. In the NBA and FIBA/WNBA, the three-point line becomes parallel to each sideline at the points where the arc is 3 feet (0.91 m) from each sideline; as a result the distance from the basket gradually decreases to a minimum of 22 feet (6.71 m). In the NCAA the arc is continuous for 180° around the basket. There are more variations (see main article).
The three-point line was first tested at the collegiate level in a 1945 NCAA game between Columbia and Fordham but it was not kept as a rule. At the direction of Abe Saperstein, the American Basketball League became the first basketball league to institute the rule in 1961. Its three-point line was a radius of 25 feet (7.62 m) from the baskets, except along the sides. The Eastern Professional Basketball League followed in its 1963–64 season.
...
Wikipedia