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The fact that the circumferential ratio of a circle to the diameter is constant had been known from the beginning of civilization in H,,man History.From the point of view of π,there had been no theoretical progress in the improvement of calculation technique.In this paper,the author will describe the meritorious technique of Takakazu Seki,Mathematics Saint,who calculated accurate π by his sophisticated method which is very revolutionary and modem idea.The second topic in this paper is about to the beautiful and amazing results of contact problems Of spheres,especially the problem of 14 mutually and externally tangent spheres together with a large sphere inside which these small spheres are internally tangent,solved by a 10 years old boy in Edo period.
The fact that the circumferential ratio of a circle to the diameter is constant had been known from the beginning of civilization in H ,, man History. Flash the point of view of π, there had been no theoretical progress in the improvement of calculation technique. In this paper, the author will describe the meritorious technique of Takakazu Seki, Mathematics Saint, who calculated accurate π by his sophisticated method which is very revolutionary and modem idea. The second topic in this paper is about to the beautiful and amazing results of contact Problems Of spheres, especially the problem of 14 mutually and externally tangent spheres together with a large sphere inside which these small spheres are internally tangent, solved by a 10 years old boy in Edo period.