The MAXIMUM possible measure of an exterior angle of a regular polygon is:

In a regular polygon, each exterior angle = 360° / n. The fewer the sides, the larger each exterior angle. The smallest regular polygon is the equilateral triangle (n = 3), with each exterior angle = 360°/3 = 120°. This is the maximum possible value. Correspondingly, the MINIMUM possible interior angle of a regular polygon is 180° − 120° = 60°.