how much of the puck has to cross the line
Goal (ice hockey) For a goal to be scored, the puck must entirely cross the goal line between the posts and under the crossbar of the goal frame. A goal is not allowed under any of the following conditions:
Three-point field goal 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).