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.Quote:
Triangle ABC is obtuse-angled at C. The bisectors of the exterior angles at A and B meet BC and AC extended at D and E, respectively. If AB = AD = BE, prove that the angle of ACB is 108 degrees.