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Math Help - Triangle theories?

  1. #1
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    Apr 2010
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    Triangle theories?

    Hello,
    I've come across a problem which asks me to prove that i can make 2009 obtuse triangles and only ONE acute triangle within a pentagon. I was thinking that there was a theory which could prove that an infinite amount of obtuse triangles can be made within a certain shape.

    I have'nt got any other ideas besides that, so could anyone tell me if im on the right track or totally lost ?
    Also I'd appreciate it if anyone could give me an idea to how to prove this?
    Thanks in advance
    Last edited by mr fantastic; April 29th 2010 at 04:03 AM.
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