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miercuri, 28 iulie 2021

aops, 'collinear midpoints'

 (*) At https://stanfulger.blogspot.com/2021/07/own-tetrahedron.html I have proved the statement marked (*) in my proof here attached


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https://artofproblemsolving.com/community/c6h616123p3670325

 This is my synthetic proof to the subject problem: