Answer:
Straight Angle
Step-by-step explanation:
An angle that's 180 degrees is essentially a flat, 2D line in geometry. . . otherwise known as a straight angle.
90 degrees = Right-Squared Angle (Right Angle)
90<x>180 = Obtuse angle (More than 90, less than 180)
0<x>90 = Acute angle (More than 0, less than 90)
180= Straight Angle.