Thanks. That's what I saw in a book too. It's hard to tell with the head up like that but she drew me a larger triangle (I think). It looks like we were both in the acceptable range. Just opposite though. Are there landmarks you use?
Well, you can usually see that triangle defined in the muscles and ligaments. Where the side of the neck comes out of the shoulder is the base of the triangle, the bottom of the crest ligament is another side, and the muscle on the side of the neck is the third side, so you want to be inside all three of those.