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  Category:Tetragons – Wikimedia Commons

  https://commons.wikimedia.org/wiki/Category:Tetragons?uselang=de

  Keine Beschreibung vorhanden.

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  Fallacies in Mathematics - E. A. Maxwell - Google Books

  https://books.google.de/books?id=zNvvoFEzP8IC

  As Dr Maxwell writes in his preface to this book, his aim has been to instruct through entertainment. 'The general theory is that a wrong idea may often be exposed more convincingly by following it to its absurd conclusion than by merely announcing the…

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  Category:Circle geometry – Wikimedia Commons

  https://commons.wikimedia.org/wiki/Category:Circle_geometry?uselang=de

  Keine Beschreibung vorhanden.

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