Answer:
D
Step-by-step explanation:
'angle 1 + angle 2 + angle 6 = 180', as that is how triangles work. We can readjust this mathematical sentence into 'angle 6 = 180 - angle 1 - angle 2'
'angle 4 + angle 6 = 180', as the angles are a linear pair. We can readjust this mathematical sentence into 'angle 6 = 180 - angle 4.
Because angle 6 is angle 6, we know that '- angle 1 - angle 2 = - angle 4', and 'angle 1 + angle 2 = angle 4'. That knowledge lets us know that Angle 1 and 2 are the remote interior angles of exterior angle 4.
