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).
(..) What about Ultron himself? Ah. He's easy to track, he's everywhere. Guy's multiplying faster than a Catholic rabbit. Still doesn't help us get an angle on any of his plans though. - He still going after launch codes? - Yes, he is, but he's not making any headway. (..)2015 Avengers: Age of Ultron