A reflex angle is an angle that measures greater than 180 degrees and less than 360 degrees. It is formed when one arm of an angle is rotated beyond a straight line to meet the other arm on the opposite side.
The size of a reflex angle is determined by the difference between the degree measure of the angle and 360 degrees. For example, if an angle measures 220 degrees, then its reflex angle measures:
reflex angle = 360 degrees - 220 degrees
= 140 degrees
So, the size of the reflex angle depends on the degree measure of the angle and its position in a straight line.