hit off backboard
Answer 15 feet. The center of the goal is 13 feet 9 inches from the back of the free throw line. From the center of the goal to the backboard it is 1 foot 3 inches. 13' 9" + 1' 3" = 15 ' Typical placement of the backboard is to have its back 15 feet from the back of the free throw line, and inside the base line by 4 feet. This is why the arc falls off at 5 feet 3 inches ( 63") from the base line. ( The beginning of the corners )
Free throw line from basketball rim is 15 feet. The rim is twice the size of a basketball measuring across. A basketball is 9 - 9 1/2 inches long. So that means that the free throw line from the backboard is 16 feet 6 inches, or 16 feet 7 inches.