Answer:
C) supplementary angles
Step-by-step explanation:
C) supplementary angles
They add up to 180.
286
588
300
:) your welcome
Angle 2=3, so angle 1=4 because angles ABC & BCD equal 90°. When you add together the angles of a triangle you get 180 and if you could put angle 1 and 4 together it would look like an upward version.
That is the best way I could describe it. Hope that helps.