Mohamed A.

asked • 04/03/22

A question about angle bisectors that's crazy hard.

If the angle bisectors of a triangle are congruent, prove it's an isosceles triangle.


Mark M.

Did you draw and label a diagram?
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04/03/22

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Adare H. answered • 04/03/22

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So an Isosceles triangle has two sides the same, in order to prove that the opposite side angles also need to be the same.

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Mohamed A.

After much thinking, me and friends weren't able to come up with a coherent proof, but I emailed a professor teaching at a university nearby, and she said it was a famous theorem. The Steiner Lehmus theorem. That's by far the hardest question I attempted to answer. Thanks!
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04/04/22

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