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angle bisectors -open problem?
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Otman
Nov 10, 2017, 11:50:00 AM11/10/17
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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?
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?
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