The 80-80-20 Triangle Problem, A Derivative
ABC is an isosceles triangle with vertex angle
(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
- Solution #8
- Solution #9
- Solution #10
- Solution #11
Reference
- C. Knop, A Story with Geometry, or Nine Solutions to One Problem, Kvant, 1993, no 6
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