Oai, Dao Thanh Equilateral triangles and Kiepert perspectors in complex numbers. (English) Zbl 1315.51011 Forum Geom. 15, 105-114 (2015). Summary: We construct two equilateral triangles associated with an arbitrary hexagon, and show that they are perspective. Cited in 1 Document MSC: 51M04 Elementary problems in Euclidean geometries Keywords:equilateral triangles; hexagon PDF BibTeX XML Cite \textit{D. T. Oai}, Forum Geom. 15, 105--114 (2015; Zbl 1315.51011) Full Text: Link