In High School Basketball the 3 point line is set at 19 feet 9 inches, in the NCAA it is 20 feet 9 inches and in the NBA the 3 point line is 23 feet 9 inches. All 3 are measured from the center of the goal to the far side of the arc.
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In High School the Arc radius is 19 feet 9 inches (6.02 m), no less than 5 feet 3 inches (1.60 m) from each sideline.
In College the Arc radius is 20 feet 9 inches (6.32 m), no less than 4 feet 3 inches (1.30 m) from each sideline.
In the WNBA the Arc radius is 22 feet 1.75 inches (6.7501 m), no less than 3 feet 4 inches (1.02 m) from each sideline.
In the NBA the Arc radius is 23 feet 9 inches (7.24 m), no less than 3 feet (0.91 m) from each sideline.
In the FIBA the Arc radius is 6.75 meters (22.1 ft), no less than 0.9 meters (3.0 ft) from each sideline.
Depends on if it is a high school 19' 9'', college 20' 9'', or professional court 23' 9'' (NBA).