a salesman who's always looking for an 'angle' [=looking for a way to convince people to buy the things he is selling]
The two lines meet at a 30-degree 'angle' to each other. = There is a 30-degree 'angle' between the two lines.
The two lines form a sharp 'angle'. = The two lines meet/intersect at a sharp 'angle' (to each other).
(..) The wind in my... cheat sheet! Stop! No! Oh, gosh! Oh, gods! Oh, no! All right, OK, you've gotta kind of angle yourself. OK, no, no, no. Come back down towards me! Come back down... Yeah! Come on. No, thanks. I'm good. (..)2010 How to Train Your Dragon