convex pentagon with each diagonal an angle trisector, is it regular?
Source: Germany Federal - Bundeswettbewerb Mathematik 2011, round 1, p3
April 10, 2020
pentagongeometryconvexdiagonalstrisectordiagonal
Problem Statement
The diagonals of a convex pentagon divide each of its interior angles into three equal parts.
Does it follow that the pentagon is regular?