equilateral of side 1 is covered by 5 congruent equilateral of side s<1
Source: Switzerland - Swiss TST 2000 p3
February 19, 2020
Equilateralcombinatorial geometrygeometry
Problem Statement
An equilateral triangle of side is covered by five congruent equilateral triangles of side with sides parallel to those of the larger triangle. Show that some four of these smaller triangles also cover the large triangle.