Hello teacher! I am a student that is listening to your geometry lecture. I was solving chapter 1 lesson 3 exersises problems, and I had a question for number 1. For number 1, I got two answers, which are angle AOB and EOD. However, in the lecture and the answer key, it said the answer is only one, which is angle AOB. You said that complementary angle does not need to be adjacent angle, so I thought angle EOD is complementary angle for angle BOC. Since angle EOD is vertical angle to angle AOB, angle EOD is same as angle AOB. Doesn't angle EOD is also an answer too? Thank you! (There might be some typo!)