January 31st, 2010, 07:44 PM  #1 
Member Joined: Jan 2010 Posts: 43 Thanks: 0  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!

January 31st, 2010, 08:51 PM  #2  
Math Team Joined: Dec 2006 From: Lexington, MA Posts: 3,267 Thanks: 407  Re: Geometry Triangle Proof Hello, meph1st0pheles! Quote:
Code: A * /\ /12\ /  \ /  \ /  \ /  \ / 34 \ B *    *    *C D  

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geometry, proof, triangle 
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