noun

geometryan angle whose measure is greater than 180 degrees but less than 360 degrees.
A reflex angle is an angle whose measure is greater than 180 degrees but less than 360 degrees.
An angle is a measure of rotation or turning and is usually measured in degrees or radians. In geometry, an angle is the figure formed by two rays, sharing a common endpoint called the vertex.
An acute angle is an angle that measures less than 90 degrees.
An obtuse angle is an angle that measures more than 90 degrees but less than 180 degrees. It is larger than a right angle and smaller than a straight angle.