Convex polygon
From AoPSWiki
A convex polygon is a polygon whose interior forms a convex set. That is, if any 2 points on the perimeter of the polygon are connected by a line segment, no point on that segment will be outside the polygon. For example, every regular polygon is convex.
All internal angles of a convex polygon are less than 
. Equivalently, all external angles are less than . The sum of the exterior angles of any convex polygon is 
and the sum of the internal angles of a convex 
-gon is 
.
The convex hull of a finite set of points is a convex polygon with some or all of the points as its vertices.
See also
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