Cesare Donolato, A vector-based proof of Morley's trisector theorem,
Forum Geometricorum, 13 (2013) 233--235; corrigendum, 326.

Abstract. A proof is given of Morley's trisector theorem using elementary vector analysis and trigonometry. The known expression for the side of Morley's equilateral triangle is also obtained.

[ps file] [pdf]

Corrigendum: [ps file] [pdf]

Join yahoo discussion group Advanced Plane Geometry
to receive FG publication announcements.