3 of 51 vertices of 101-regular polygon are vertices of an isosceles
Source: Czech-Polish-Slovak Junior Match 2012, Individual p4 CPSJ
March 11, 2020
polygonregular polygoncombinatoricscombinatorial geometryisosceles
Problem Statement
Prove that among any vertices of the -regular polygon there are three that are the vertices of an isosceles triangle.