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January 31st, 2010, 07:44 PM   #1
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Geometry Triangle Proof

If the altitude from vertex A in triangle ABC is also the bisector of angle A, prove AB=AC. I'm trying to do this without drawing a picture but I struggle with proofs. Any help or hints to get me started are greatly appreciated. I am using Birkhoff's Axiomatics. Thanks!
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January 31st, 2010, 08:51 PM   #2
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Re: Geometry Triangle Proof

Hello, meph1st0pheles!

Quote:

[color=beige]. . [/color]
Code:
              A
              *
             /|\
            /1|2\
           /  |  \
          /   |   \
         /    |    \
        /     |     \
       /     3|4     \
    B * - - - * - - - *C
              D













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