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## Main Question or Discussion Point

I'm writing the Euclid contest this April so i went to their http://www.cmc.uwaterloo.ca/english/contests/euclid.shtml" [Broken] and downloaded the 2007 version. I don't know how to solve problems similar to questions 7. b), 8. b), and 10. I have never been taught how to do these problem so I'm asking you guys if you know a link to some website where i can learn to solve these types of questions.

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