Geodesic
Oriented angles, generalized pedal triangles and generalized Simson lines
Matematičeskoe obrazovanie, Tome 104 (2022) no. 4, pp. 2-10.

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

In the article, with the help of oriented angles, the concepts of a generalized pedal triangle and a generalized Simson's line are introduced. For the newly introduced concepts, several properties are proved that are analogous to those of pedal triangles and the Simson line. 
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A. N. Afanasyev. Oriented angles, generalized pedal triangles and generalized Simson lines. Matematičeskoe obrazovanie, Tome 104 (2022) no. 4, pp. 2-10. http://geodesic.mathdoc.fr/item/MO_2022_104_4_a0/

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[2] A. Ruinskii, “Pedalnyi treugolnik”, 2001, no. 4(19), 65–78

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[5] 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>

[6] A. N. Afanasev, “Prostye geometricheskie fakty, pomogayuschie reshit zadachu po geometrii”, Matematicheskoe obrazovanie, 2020, no. 2(94), 2–17

[7] A. N. Afanasev, Olimpiadnye zadachi po geometrii, Ileksa, 2022