Originally Posted by Momoko
1.) AC=BC; Angle 1 = Angle 3
2.) <ADE + Angle 1 = 180; <BED + Angle 3 = 180
3.) <FED + <FEB = <BED; <FDA + <FDE = <ADE
4.) <FDE = <DEF
5.) FD = FE
6.) Triangle DFE is isosceles.
Bleh, that's what I came up with. Then again, I don't remember much about Geometry because I did it last year. Though I think I did it right for that.
Thanks for trying to help, but I solved it before I looked at this thread again. I guess this can be locked?