MathDB
ontruse triangle with angles 120^o anomg 6 points

Source: 1958 Hungary - Kürschák Competition p1

October 10, 2022
combinatoricscombinatorial geometryobtuse

Problem Statement

Given any six points in the plane, no three collinear, show that we can always find three which form an obtuse-angled triangle with one angle at least 120o120^o.