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Except for Triangles, every Simple Polygon has at least two nonoverlapping Ears.
See also Ear, One-Mouth Theorem, Principal Vertex
References
Meisters, G. H.  ``Principal Vertices, Exposed Points, and Ears.''  Amer. Math. Monthly 87,
  284-285, 1980.
 
Toussaint, G.  ``Anthropomorphic Polygons.''  Amer. Math. Monthly 122, 31-35, 1991.