A reflex angle is an angle that measures more than 180 degrees but less than 360 degrees. It is the larger angle formed when two lines or rays meet at a point, creating an opening that extends beyond a straight line. Reflex angles are commonly found in various geometric shapes and designs. In geometry, reflex angles can be identified by their position and measurement. For example, if you have a full circle of 360 degrees, a reflex angle would be any angle that exceeds 180 degrees but is less than 360 degrees. Understanding reflex angles is important in fields like architecture and engineering.