angle

[OED]: 4. a. The indefinite space between two lines or surfaces that meet, at or close to their meeting point; the shape formed by lines that meet. Also: the degree of divergence of two lines from one another, or of one line from a horizontal or vertical reference line or axis.

angle

in
Source: 
Battista (2007)

...students might abstract the similarity between intersections of lines, corners, bends in paths, and slopes (p 888). ...the difficulties that students (have) relating the standard angle concept to various angle contexts (e.g. turning, slope) seemed to be directly dependent on the visual availibility or salience of structural angle components (the two sides and the vertex) in the contexts (p 889).

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