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duminică, 1 august 2021

aops, symmetries, https://artofproblemsolving.com/community/c6t48f6h2635988_isosceles_triangle_length_chasing_maybe


 

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Nice problem, lost source, again

 Today I saw an old problem on fb geometry sites, with a very nice solution bearing the inconfoundable signature of Master Hasan Ata; attach...