A complete angle is an angle that measures exactly 360° or $2\pi$ radians. It represents a complete turn or rotation around a point, forming a circle around that point. A complete angle can be formed by a straight line that rotates 360° to reach its initial position. It is also called a full angle, a round angle, or a perigon. Four right angles or two straight angles make a complete angle. A complete angle can be represented in three different angle measuring systems: 360° in the sexagesimal system, $2\pi$ in a circular system, and 400g in the centesimal system.