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Topic: angle bisectors -open problem?
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Posts: 2
Registered: 8/4/13
angle bisectors -open problem?
Posted: Nov 10, 2017 11:48 AM
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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?

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