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Polygons can be classified several different ways.
A Concave is a polygon in which one or more of the interior angles is greater than 180 degrees.
As a result it looks like one vertex has been pushed inward.
Some people remember the difference between Concave and Convex polygons by,
Envisioning a concave polygon has cave.
The cave is created by the interior angle greater than 180 degrees.
A line can be drawn through a concave polygon that will intersect the polygon in more than two places.
A Polygon that does not have an interior angle greater than 180 degrees.
It has an appearance of all of the vertices pointing outward.
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