Definition:Polygon/Internal Angle
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Definition
The internal angle of a vertex of a polygon is the size of the angle between the sides adjacent to that vertex, as measured inside the polygon.
Also known as
An internal angle is also known as an interior angle.
The vertices and the sizes of the internal angles of those vertices are frequently referred to by the same letter.
Thus the angle of vertex $A$ is called angle $A$ and denoted $\angle A$.
This is considered by some to be an abuse of notation but its convenience outweighs its disadvantages.
Also see
- Results about internal angles can be found here.
Sources
- 1998: David Nelson: The Penguin Dictionary of Mathematics (2nd ed.) ... (previous) ... (next): interior angle: 1.
- 2008: David Nelson: The Penguin Dictionary of Mathematics (4th ed.) ... (previous) ... (next): interior angle: 1.
- 2014: Christopher Clapham and James Nicholson: The Concise Oxford Dictionary of Mathematics (5th ed.) ... (previous) ... (next): interior angle (of a polygon)