What is the definition of a reflex angle?

A reflex angle is indeed defined as an angle that measures greater than 180 degrees but less than 360 degrees. This means that reflex angles are those that open outwards more than a straight angle (which is 180 degrees) but do not complete a full rotation (which would be 360 degrees). In geometric terms, if you visualize a circle, the reflex angle would be the larger amount of rotation around the circle between the two rays forming the angle.

This understanding of reflex angles is significant in the study of various geometric principles, as well as in practical applications like architecture, design, and various fields of engineering, where different types of angles are essential.