RECOMMENDATIONS OF THE NATIONAL ASSOCIATION OF BASKETBALL COACHES (Presented by W. S. Chandler) Rule 2, Section 2. Partial extension of the end lines, Extend the middle portion of the end lines by drawing an are with a radius of 24 feet with the center at the outer edges of the foul circle where it intersects the long axis of the court. This arc shall act as an extension of the end line and shall terminate where the arc intersects the present end line. (Carried 27-7) Rule 8, Section 8(Note). Ten second rule.