Problem Pedro Miranda, Training Geometry Olympiad, https://www.facebook.com/photo/?fbid=4446745348734828&set=gm.572767433983574

 

aops, https://artofproblemsolving.com/community/c4t48f4h2703493_find_the_angles_of_a_triangle

 

https://www.facebook.com/photo/?fbid=4380229928729538&set=gm.1200780940413283

 A solution (?)

equilaterals

 Years ago I published the attached problem, with synthetic solution

Problem, S.R. Peru Geometrico, https://www.facebook.com/photo/?fbid=10222065396297018&set=gm.3807081229404742

 

First problem of https://www.facebook.com/Matem%C3%A1tica-preuniversitaria-111349621225123/photos/pcb.135514875475264/135514668808618/

 A solution, out of scheduled training

Geometria Top, Gokham Aydin, https://www.facebook.com/photo/?fbid=3503645329711506&set=gm.864109817692722

 

Ahmet Cetin, Geometria Top, https://www.facebook.com/photo/?fbid=4356787147770274&set=gm.1053504675419901

 Completion of the proof can be seen at https://artofproblemsolving.com/community/c6t48f6h2683868_a_right_angled__triangle_and_bisector

ONM Costa Rica 2018, https://artofproblemsolving.com/community/c6t48f6h2684613_bf__cg_wanted_bd__ec_given_line__angle_bisector