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Geometry with Circle and Triangle

  1. Nov 25, 2011 #1
    Hi. This question is on geometry with circle and triangle. But I am posting here and not in the Homework section because it is a problem that I am trying to do (so not Homework)...

    and because I am stuck only on 2 parts of the solution and not the whole solution...

    Thank you....

    http://img256.imageshack.us/img256/9475/gtewp249no24.jpg [Broken]

    [ How did they get this? They never explained or proved this and it is NOT obvious from the picture.

    Blue: How is that implication true? By what theorem or reasoning?
    Last edited by a moderator: May 5, 2017
  2. jcsd
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