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8th Grade of Elementary School Professor Maurício Carvalho Introducing the number pi The number pi is defined as the ratio between the length and the diameter of a circle. In this class we discuss how approximations to pi can be obtained by approximating the circle by polygons. Access more video classes and all the material from the Mathematics Portal at http://matematica.obmep.org.br The rights over all the material in this channel belong to the Institute of Pure and Applied Mathematics, and it is forbidden to use all or part of it without prior written authorization from the aforementioned holder, except in the cases prescribed in the current legislation. The rights over all the material in this channel belong to the Institute of Pure and Applied Mathematics, and it is forbidden to use all or part of it without prior written authorization from the above mentioned holder, except in the cases prescribed in the current legislation.