China first calculated that pi should be 3.1415926

China was the first to calculate that pi should be 3.1415926, which is correct.

How to correctly calculate the value of pi has always been an important topic in the history of world mathematics. Ancient Chinese mathematicians attached great importance to this issue and studied it very early. In "Zhou Bi Suan Jing" and "Nine Chapters of Arithmetic", the ancient ratio of three times the diameter of a week was proposed, and the fixed pi ratio was three, which is the circumference of a circle. That is to say, the circumference of a circle is three times the diameter.

Since then, through successive explorations by mathematicians of all generations, the calculated pi value has become increasingly accurate. Zhang Heng in the Eastern Han Dynasty calculated a pi value of 3.162, Wang Fan in the Three Kingdoms period calculated a pi value of 3.155, and in the Wei and Jin Dynasties, the pi value calculated was 3.155. The famous mathematician Liu Hui calculated 3.14, while Zu Chongzhi calculated pi to be between 3.1415926 and 3.1415927.

Introduction to Zu Chongzhi:

Zu Chongzhi, whose courtesy name was Wenyuan, was born in Jiankang, which is now Nanjing. He was an outstanding mathematician and astronomer in the Southern and Northern Dynasties of China. Zu Chongzhi once said in his book , he has been "specializing in numerology and searching for ancient and modern times" since he was very young.

He collected almost all kinds of documents and materials from ancient times to the time when he lived for investigation. At the same time, he advocated never "falsely pushing forward the ancients" and never limiting himself to the outdated and erroneous conclusions of the ancients. Among them, and personally carry out precise measurements and careful calculations.

As he himself said, he always "measures the rules personally, observes the leakage of instruments, sees every detail, and is at a loss to make plans." The greatest achievement of his life was to accurately measure the circumference of pi to seven decimal places for the first time, which was between 3.1415926 and 3.1415927. The ancestral ratio he proposed made a significant contribution to the study of mathematics.