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  1. Stygian

    HSC 2013-14 MX1 Marathon (archive)

    Re: HSC 2013 3U Marathon Thread is it 1500? (tried to do it in my head lol)
  2. Stygian

    HSC 2014 MX2 Marathon (archive)

    Re: HSC 2014 4U Marathon your proof is more elegant and yes the the perpendicular bisectors do meet at the circumcentre (interesting to note is that this occurs irrespective of whether this circumcentre is external to the triangle or not) In terms of what Sy said, the orthocentre is...
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