Geometry problems solving - my point of view
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vineri, 9 ianuarie 2026
Aops, Taiwan APMO 2021, https://artofproblemsolving.com/community/c4t48f4h3746229_nested_altitudes
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https://math.stackexchange.com/questions/3855225/abcd-is-a-quadrilateral-with-ab-bc-and-bcda-and-angle-abd-x-angl?rq=1
Nice problem, lost source
Full solution of https://www.facebook.com/photo/?fbid=1899709203808549&set=a.148394885606665
Thanking to Alin Cretu,
A problem with lost source again!
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