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B Bisecting angle proof

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  1. Nov 11, 2015 #1
    Hi, guys, i made an exercise, can you prove this?
    xybn6vc.png
    m(∠EAD)=[m(∠ABC)-m(∠ACB)]/2
    If you have 5 free minutes, try it, i hope you'll like it!
    It's my first own exercise, so I would like some feedback, too.
    AD= bisecting(splits angle in 2 equal sides)
     
    Last edited: Nov 11, 2015
  2. jcsd
  3. Nov 11, 2015 #2

    HallsofIvy

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    You can't prove this, it is, generally, not true. By choosing D at different places along BC, angle EAD can take on many different values while the right side, not depending on D, is fixed. Was there some other condition on D you did not give?
     
  4. Nov 11, 2015 #3
    My bad, I forgot to add that AD splits the angle in 2 equal sides(angles).
     
  5. Nov 12, 2015 #4

    NascentOxygen

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    Thread closed for moderation.
     
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