Naming and Classifying Polygons

    Any polygon is named by writing its vertices in some order.

Ex1) This could be named ABDC, DCAB, CABD, etc...

    We can classify polygons into two types, namely CONVEX, or NON-CONVEX(sometimes called CONCAVE).  All triangles are convex polygons, but any polygon with more than three sides is not guaranteed to be convex.  Some examples are below.
 

Ex 2) Polygon ABCED is convex. 
Ex 3)  Polygon ABEDC is concave.
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