Problem

Source: 2013 Saudi Arabia Pre-TST 3.3

Tags: combinatorics, Coloring, combinatorial geometry



The points of the plane have been colored by $2013$ different colors. We say that a triangle $\vartriangle ABC$ has the color $X$ if its three vertices $A,B,C$ has the color $X$. Prove that there are innitely many triangles with the same color and the same area.