MathDB
Geometric inequality 2

Source: JBMO Shortlist 2002

November 12, 2008
inequalitiesgeometryrectanglegeometry proposed

Problem Statement

Let A1,A2,...,A2002 A_1,A_2,...,A_{2002} be arbitrary points in the plane. Prove that for every circle of radius 1 1 and for every rectangle inscribed in this circle, there exist 33 vertices M,N,P M,N,P of the rectangle such that MA1+MA2++MA2002+ MA_1 + MA_2 + \cdots + MA_{2002} + NA1+NA2++NA2002+NA_1 + NA_2 + \cdots + NA_{2002} + PA1+PA2++PA20026006PA_1 + PA_2 + \cdots + PA_{2002}\ge 6006.