• Descobrindo o número π 

      Keller, Flávia Adolf Lutz (Universidade Federal de São Carlos, UFSCar, Programa de Pós-graduação em Matemática (PROFMAT), , 24/08/2013)
      The value of the circumference s length divided by its diameter has a result a constant named π. This value is known since ancient times by the Greeks and Egyptians, but only in current history this constant has been ...