It is done from the free throw line, about 20 feet from the hoop.
The free throw line is always 15 ft from the line to the backboard
It is always 15 feet away from the hoop.
13 feet 9 inches from behind the line to the center of the goal ( measured horizontally ).
The back of the free throw line/ or foul line is 13 feet 9 inches from the center of the goal or hoop for standard play.
From the guidebook published by the NCAA, the front of the free throw line is 18 feet, 10 inches from the end line. The back of the line is 19 feet, and the center of the 18 inch hoop is 63 inches from the end line. So the back of the free throw line is 13 feet 9 inches from the center of the hoop.
From behind the free throw line to the center of the goal or hoop the distance is 13 feet 9 inches. The question is not asking about the distance to the backboard; but if you are setting up your own system, it would be 15 feet to the backboard from behind the free throw line. The shooters foot gear can not touch the line, hence you must be in back of the line. FYI: The FTL is 2 inches wide.
15 feet
The back of the free throw line is 15 feet from the backboard and 13 feet 9 inches to the center of the goal.
The free throw line is 15 feet from the basket in both NCAA and NBA.
2 feet
15 ft