Muramatsu Shigekiyo was a Japanese mathematician and curator of the Edo period, born in 1608 and dying in 1695. He is known for being the first to calculate the volume of a sphere using very thin slices, and the first to use inscribed and circumscribed polygons to approximate the circumference of a circle and hence pi. Using a polygon of 32,768 sides he calculated a perimeter of 3.141592648. He published his value of pi to 22 decimal places in his 1663 book Sanso, the Stack of Mathematics, though only eight of them were correct. In 1681 Seki Takakazu used the same method with a polygon of 131,072 sides and obtained pi correct to eleven decimal places.
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Muramatsu Shigekiyo (村松 茂清; 1608 – 1695) was a Japanese mathematician and curator in the Edo period.
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1. Muramatsu Shigekiyo (Wikipedia)
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Muramatsu Shigekiyo (村松 茂清; 1608-1695) was a Japanese mathematician and curator in the Edo period.
Biography, birth
Muramatsu Shigekiyo (村松 茂清; 1608-1695) was a Japanese mathematician and curator in the Edo period.
Biography, gender
He is known for being the first to calculate the volume of a sphere using very thin slices, and to use inscribed and circumscribed polygones to approximate the circumference of a circle, and hence π.
In Branch: Geometry, Lead, field of work
He is known for being the first to calculate the volume of a sphere using very thin slices, and to use inscribed and circumscribed polygones to approximate the circumference of a circle, and hence π.
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