MathDB
a - d = e - b = c - f in equiangular hexagon

Source: Oliforum Contest III 2012 p3 https://artofproblemsolving.com/community/c2487525_oliforum_contes

September 28, 2021
hexagonequal anglesgeometry

Problem Statement

Show that if equiangular hexagon has sides a,b,c,d,e,fa, b, c, d, e, f in order then ad=eb=cfa - d = e - b = c - f.