What is a restricted area?

Football restricted areas are divided into big restricted areas and small restricted areas. The small restricted area is also called the goal area. On the lines 5.5m away from the inside of the goal at both ends of the playing field, a line with a length of 5.5m perpendicular to the end line is introduced into the field, with one end connected to the goal and the other end connected to each other and parallel to the end line. The area within the range of these three lines and the end line is the small restricted area. The forbidden area is the end line at the two ends of the competition field 16.5m away from the inside of the goal post. Draw a line with a length of 16.5m and perpendicular to the end line into the field. The other ends of these two lines are connected with each other and parallel to the end line, and these three lines surround the city with the end line.