View attachment angle bisectors.pdf
*AD*, *BE*, *CF* are altitudes of ∆*ABC*. Prove what these same segments are in ∆*DEF*.
View attachment 18204
My guess is they are angle bisectors. I can not prove this however. I have been trying to prove it with similar and congruent triangles however I have not been able to get anywhere significant.
Thanks in advance

Yes, they are bisectors.

Attached is one way to show this for equilateral, isosceles and scalene triangles.