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

## Homework Statement

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

## Homework Equations

all radii are congruent, cpctc, ASA, congruent supplementary angles are right angles

## 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.

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