The width of the key in the NBA is 16 feet (4.9 m), including the wide foul lanes;[REF] in U.S. college (NCAA) and high-school play, it is 12 feet (3.7 m) [REF].
The free throw circle has a six-foot (1.8 m) radius and is centered at the midpoint of the free throw line; the half of that circle on the mid-court side of the free throw line is painted solid.