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).
(..) cause perspiration in the summer, it's directly in the path of a cross-breeze created by opening windows there and there it faces the television at an angle that is neither direct, thus discouraging conversation, nor so far wide as to create a parallax distortion. I could go on,but I (..)2007 TvShow: The Big Bang Theory Title: Pilot Season: 1 Episode 1