Geodesic
Another proof of Morley's theorem
Matematičeskoe obrazovanie, no. 2 (2023), pp. 12-16
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The article provides a proof of Morley's Theorem based on the properties of oriented angles. At the end, two examples of quadrilaterals are given for which an analog of Morley's theorem holds. 
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A. N. Afanasyev. Another proof of Morley's theorem. Matematičeskoe obrazovanie, no. 2 (2023), pp. 12-16. http://geodesic.mathdoc.fr/item/MO_2023_2_a2/

[1] S. Greittser, G. S. M. Kokseter, Novye vstrechi s geometriei., Nauka, M., 1978, 224 pp.

[2] I. Yaglom, G. Tonoyan, “Teorema Morleya”, Kvant, 1978, no. 8

[3] L. Shteingarts, “Snova o teoreme Morleya”, Kvant, 2009, no. 5

[4] Evan Chen, Euclidean Geometry in Mathematical Olympiads., The Mathematical Association of America, 2016 | MR