Liu Hui
Videos
Liu Hui was a Chinese mathematician who published a commentary in 263 CE on Jiu Zhang Suan Shu. He was a descendant of the Marquis of Zixiang of the Eastern Han dynasty and lived in the state of Cao W
Survey of sea island
Pi
Videos
The number π is a mathematical constant, approximately equal to 3.14159, that is the ratio of a circle's circumference to its diameter. It appears in many formulae across mathematics and physics, and
Liu Hui
…In his commentaries on The Nine Chapters on the Mathematical Art, he presented: An algorithm for the approximation of pi (π). While at the time, it was common practice to assume π to equal 3, Liu utilized the method of inscribing a polygon within a circle to approximate…
Archimedes developed the polygonal approach to approximating π.
Isaac Newton used infinite series to compute π to 15 digits, later writing "I am ashamed to tell you to how many figures I carried these computations".
The earliest known use of the Greek letter π to represent the ratio of a circle's circumference to its diameter was by Welsh mathematician William Jones in 1706.
Leonhard Euler popularized the use of the Greek letter π in works he published in 1736 and 1748.