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sâmbătă, 13 septembrie 2025

https://artofproblemsolving.com/community/c4t48f4h2130476_isosceles_and_perpendicular_right_isosceles_2016_romanian_nmo_grade_vii_p4

 


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F.B. page of Erdem Balkan, https://www.facebook.com/photo?fbid=24428580853509491&set=a.949297615197812

 My solution courtesy of Master Alin Pop solution to the nice lemma used for this purpose attached: