Concave Polygon -- from Wolfram MathWorld
- ️Weisstein, Eric W.
- ️Thu May 22 2003
A concave polygon is a polygon that is not convex.
A simple polygon is concave iff at least one of its internal angles is greater than 
. An example of a non-simple (self-intersecting)
polygon is a star polygon.
A concave polygon must have at least four sides.
See also
Convex Polygon, Polygon, Simple Polygon
Portions of this entry contributed by David Terr
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Cite this as:
Terr, David and Weisstein, Eric W. "Concave Polygon." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/ConcavePolygon.html