Description: ancient times, many people committed to the ratio of the circumference research and calculation. In order to calculate the ratio of the circumference increasingly good approximation, the generations of mathematicians for the mysterious few of the numerous contributions of time and effort. Before the 19th century, the ratio of the circumference calculated Progress has been very slow and 19th centuries, we have calculated the ratio of the circumference of World Records frequently innovation. Throughout the 19th century, it is the ratio of circumference to the manual calculation of the largest in the century.
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