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Help with median problem

  1. Nov 1, 2007 #1
    http://www.wpr3.co.uk/UKMT/smc.html scroll down to q15

    On this question that wants me to find the portion of the area covered by PQRT, I get to to the point where I make line PR, which goes through the middle of the square which I called 'O'.

    Now someone told me that I know that OT is 1/3 of OS and therefore the area of PTR is 1/3 of PSR. I know it has something to do with medians, but can someone explain this part to me?

    I can solve the rest of the question bas I know that PTR is a third of the area of PSR and hence a sixth of the area of the square PQRS.
  2. jcsd
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