# Definition:Polygon/Notation and Terminology

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## Polygon: Notation and Terminology

Both the vertices and the sizes of the internal angles of those vertices are frequently referred to by the same symbol.

Thus **the size of the internal angle at 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.