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Otman
Posts:
2
Registered:
8/4/13


angle bisectors open problem?
Posted:
Nov 10, 2017 11:48 AM


equality of angles bisectors lengths in a triangle leads to an isosceles triangle is a well known theorem. The only proofs are based on using the lengths formula of angle bisectors or proving by contradiction.a direct proof,surprisingly, is still challenging!. Is a direct way to prove it( without the lengths formula) still unknown?



