That is a straight angle.
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There is no special name for a 120º angle.
obtuse
An angle from 181 degrees to 359 degrees is called a reflex angle. A reflex angle is an angle that measures greater than 180 degrees but less than 360 degrees. It is formed by rotating a ray less than one full revolution, resulting in an angle that extends beyond a straight line.
The 4 classifications are:- 1 Acute angle which is greater than 0 but less than 90 degrees 2 Right angle which is 90 degrees 3 Obtuse angle which is greater than 90 but less than 180 degrees 4 Reflex angle which is greater than 180 but less than 360 degrees A full rotation is 360 degrees
Congruent angles have the same measure. congruent Kenpachi54 improve answer: Actually, angles don't have to be congruent just to have the same angle measurements A has a right angle is 90 degrees. even if there is a small right angle and a large right angle you know they are both 90 degrees because ALL right angles are 90 degrees, so there is really no name for it.