Geometry Proof question help

[f1f2f3]

I have this Geometry problem here which is a proof question.
I am really unsure of where to start, but I have been told by the teacher that using congruent triangles might help, but does that mean I will need to draw in a line onto the diagram? I'm not quite sure where to start.
Thanks.

 

[shooterman]

Yes bi in bisect means two since the both angles of ABC and BAC is the same than you have a perfect triangle which is the same length on all sides.
It doesn't matter where you bisect(draw the line) you will get congurent triangles bisecting at any angle

 

[Mrspi]

Yes bi in bisect means two since the both angles of ABC and BAC is the same than you have a perfect triangle which is the same length on all sides.
It doesn't matter where you bisect(draw the line) you will get congurent triangles bisecting at any angle

HUH?

Please explain your thinking here.

As a geometry teacher for more than 30 years, I could not help with this problem, because there is nothing in the GIVEN which would help with the proof.

 

[Denis]

Easy enough to see that more info is required:
try it with the bisected angle being the right angle in a 30-60-90 triangle.

And Shooter, after reading what you posted, I suggest you have a looooooong talk with your Geometry teacher :shock: