Bundeswettbewerb Mathematik 1989 Problem 1.3
Source: Bundeswettbewerb Mathematik 1989 Round 1
September 24, 2022
polygongeometryconvex quadrilateralconvex
Problem Statement
A convex polygon is divided into finitely many quadrilaterals. Prove that at least one of these quadrilaterals must also be convex.