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).
(..) Which suggests they were both the result of one blow from a single weapon. Well, the first mark was made at a -degree angle and the second one is... degrees. This couldn't have been a knife. Maybe the corner of an object? Make that the corner (..)2015 TvShow: Bones Title: The Promise in the Palace Season: 11 Episode 7
(..) a gnarly landing. Yeah, gnarly and painful. The mountain biker said that this bone lodged itself into his arm. The sub-pubic angle of the pelvis tells me that the victim was a female. Bone density suggests that she was around her mid-s. (..)2015 TvShow: Bones Title: The Promise in the Palace Season: 11 Episode 7