i'm just workin on my algebra and discrete geometry homework, and I'm having trouble with the following question:

I'm totally lost as to where to start. If anyone could post a few pointers to get me started, I'd appreciate it.TriangleABCis obtuse-angled atC. The bisectors of the exterior angles atAandBmeetBCandACextended atDandE, respectively. IfAB=AD=BE, prove that the angle ofACBis 108 degrees.