Who invented pi?

Pi is a concept and a definition, and there is no question of who invented it. For the accurate calculation of pi, how accurate it is in each period is recorded. Mathematician Zu Chongzhi has made great contributions to pi.

1. Archimedes was the first person to seek the value of pi by scientific methods. In The Measurement of Circles (3rd century BC), he determined the upper and lower bounds of the circumference of a circle by using the circumference of a regular polygon inscribed in and circumscribed by a circle. Starting from a regular hexagon, he multiplied it to a regular 96-sided polygon and got (3+(1/71)) <: π < (3+(1/7)), created a geometric method for calculating pi (also known as classical method or Archimedes method), and got the π value accurate to two decimal places.

2. When Liu Hui, a mathematician in China, annotated Nine Chapters Arithmetic (263), he obtained the approximate value of π only by inscribed a regular polygon in a circle, and also obtained the π value accurate to two decimal places. His method was later called cyclotomy. He used cyclotomy until the circle inscribed a regular polygon.

3. Zu Chongzhi, a mathematician in the Northern and Southern Dynasties, further obtained the π value accurate to seven decimal places (about the 5th century)

4. In the west, it was not until 1573 that Otto, a German, got it after a long and arduous study. He calculated the pi between 3.145926 and 3.145927, becoming the first scientist in the world to calculate the pi to more than seven figures.

Extended information:

International pi day

In p>211, the International Mathematical Association officially announced that March 14th of each year would be designated as the International Mathematics Festival, and the source was Zu Chongzhi, an ancient mathematician in China. ?

the international pi day can be traced back to March 14th, 1988, when Larry Shaw, a physicist at the San Francisco Science Museum, organized museum staff and participants to do 3 1/7 circles (22/7, one of the approximations of π) around the museum monument and eat fruit pie together. Later, the San Francisco Science Museum inherited this tradition and held celebrations on this day every year.

In p>29, the U.S. House of Representatives formally passed a non-binding resolution to designate March 14th as "pi day" every year. The resolution holds that "since mathematics and natural science are interesting and indispensable parts of education, and learning about π is a fascinating way to teach children geometry and attract them to study natural science and mathematics ... π is about 3.14, so March 14th is the most appropriate day to commemorate pi day."

Reference: Baidu Encyclopedia-Pi.