The narrative structure of monster
shows what the people around steve are saying.
includes steve writing about himself in the third person.
gives a broader perspective on the events.
shows steve's inner thoughts and fears.
o
che

I'm a bit puzzled here because they did not provide you with any measures of the other angles, so i am unable to provide a theorem or postulate to support my answer, but i'd say 90 degrees because it looks closer to a right angle than anything.