2013 OIM Problems/Problem 6
Problem
A configuration is a finite set 
of points in the plane between which there are no three collinear and each point is assigned some color, so if a triangle whose vertices are in has an angle greater than or equal to 
, then exactly two of its vertices are the same color.
Find the maximum number of points that a configuration can have.
~translated into English by Tomas Diaz. ~orders@tomasdiaz.com
Solution
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