Dividing rectangle in to dominoes and drawing diagonals...
Source:
February 13, 2011
geometryrectangleanalytic geometrygeometric transformationreflectioncombinatorics unsolvedcombinatorics
Problem Statement
A rectangle is divided into and dominoes. In each domino, a diagonal is drawn, and no two diagonals have common endpoints. Prove that exactly two corners of the rectangle are endpoints of these diagonals.