Question

A plane is colored with two colors (that is, every point on the plane is colored with one of these two colors). Prove that there exist two points on the plane at a distance of `1` such that they are both the same color.

Combinatorics -> Pigeonhole Principle Combinatorics -> Combinatorial Geometry Geometry -> Plane Geometry -> Triangles Proof and Example -> Constructing an Example / Counterexample Proof and Example -> Proof by Contradiction

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