Problem

Source: 2015 Sharygin Geometry Olympiad Correspondence Round P22

Tags: combinatorics, combinatorial geometry, Coloring



The faces of an icosahedron are painted into $5$ colors in such a way that two faces painted into the same color have no common points, even a vertices. Prove that for any point lying inside the icosahedron the sums of the distances from this point to the red faces and the blue faces are equal.