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]
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