Geodesic
Another proof of Morley's theorem
Matematičeskoe obrazovanie, Tome 106 (2023) no. 2, pp. 12-16.

Voir la notice de l'article provenant de la source Math-Net.Ru

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, Tome 106 (2023) no. 2, pp. 12-16. http://geodesic.mathdoc.fr/item/MO_2023_106_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 <ext-link ext-link-type='mr-item-id' href='http://mathscinet.ams.org/mathscinet-getitem?mr=3467691'>3467691</ext-link>