What is a reflex angle?

A reflex angle is an angle that measures between 180 degrees and 360 degrees. It is formed when the arms of an angle are rotated beyond a straight line (180 degrees) but do not complete a full rotation (360 degrees). Reflex angles are larger than a straight angle (180 degrees) but smaller than a full rotation (360 degrees). In geometric terms, a reflex angle is the amount of rotation needed to bring one arm of the angle back to the other arm. Reflex angles are commonly found in geometric shapes such as pentagons, hexagons, and octagons.