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Triangle inscribed on circle proof I am missing something

  1. Oct 1, 2012 #1
    Triangle inscribed on circle proof...I am missing something :(

    1. The problem statement, all variables and given/known data
    I have provided a link to the problem below
    http://imageshack.us/a/img854/4143/photo1lsd.jpg [Broken]

    I need to prove AE is an altitude on this proof

    2. Relevant equations
    all radii are congruent, cpctc, ASA, congruent supplementary angles are right angles


    3. The attempt at a solution

    I know that I need to draw in lines OB and OC for use in similar triangles and that once congruence is proven I can quickly show the supplementary angles are congruent and thus AE is an altitude.. I feel like this needs additional information saying E is the midpoint of BC....hence me being stuck. Any help would be appreciated.
     
    Last edited by a moderator: May 6, 2017
  2. jcsd
  3. Oct 1, 2012 #2

    HallsofIvy

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    Staff Emeritus
    Science Advisor

    Re: Triangle inscribed on circle proof...I am missing something :(

    Do you know, or can you prove, that any perpendicular bisector of a secant to a circle goes through the center of the circle?
     
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