


Description 



Concave: If, when you join any two points inside a figure, the resulting line segment goes outside the figure, then the figure is concave. Also called nonconvex. 
Note that a concave polygon is a polygon with at least one interior angle greater than 180 degress. One way to remember this is to think of
concave polygons being
like caves  there's a way to get "in" them. 



