in complex math the name for a 180 degree angle would be called a straight line
The last major kind of angle is the straight angle. A straight angle is an angle that measures exactly 180 degrees.
An angle between 180o and 360o is a reflex angle.
Obtuse angle is 90<a<180. flat
An angle which measures between 180 and 360 degrees is called a reflex angle.
An obtuse angle
an angle that mesures betweem 180 and 360 degrees is known as a reflex angle.
That is an obtuse angle.
A right angle (90 degrees)