Please help!!! I don’t understand this at all.

Answer:
the angles 6, 3 and 8 are of equal measure as the angle 1 because the angle 6 and 1 are opposite by vertex, the angle 8 is alternate external with the 1 and the angle 3 is also opposite by vertex with the angle 8
Step-by-step explanation:
(the explanation is on the same answer...)