The 80-80-20 Triangle Problem, A Derivative

(This problem has been invented by Sergey Yurin, at the time a ninth grade student, and reported in [Knop].

Solutions

• Solution #1
• Solution #2
• Solution #3
• Solution #4
• Solution #5
• Solution #6
• Solution #7

Reference

1. C. Knop, A Story with Geometry, or Nine Solutions to One Problem, Kvant, 1993, no 6

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Copyright © 1996-2012 Alexander Bogomolny