any 3 out of 6 segments form a triangle, what about a tetrahedron?
Source: 2006 Oral Moscow Geometry Olympiad grades 10-11 p2
October 20, 2020
geometry3D geometrytetrahedrontriangle inequality
Problem Statement
Six segments are such that any three can form a triangle. Is it true that these segments can be used to form a tetrahedron?(S. Markelov)