Pi is a very important mathematical constant, which indicates the ratio of the circumference to the diameter of a circle. In ancient times, people began to study pi and tried to calculate its value. However, because pi is an infinite cycle decimal, it is very difficult to calculate its value accurately. Let me introduce to you, who is the first person in the world who can accurately calculate pi to seven decimal places?
Zu Chongzhi, an ancient mathematician in China, was the first person in the world to make Pi accurate to seven decimal places. Zu Chongzhi, born in 429 AD, was a famous mathematician and astronomer in the Southern and Northern Dynasties. When he studied pi, he adopted a method called secant, which approached the value of pi by cutting circles continuously.
Zu Chongzhi's "Secant Circle Method" is a very accurate calculation method, which can approximate the value of pi. He first divided a square into 16 small squares, and then drew an inscribed circle and an circumscribed circle in the squares. Then, he used a line segment to connect the two points on the inscribed circle and the circumscribed circle, and then divided the line segment into eight segments.
Next, he connected eight line segments in turn to form a regular octagon. Then, he divided the regular octagon into 16 small squares, drew inscribed circles and circumscribed circles, and repeated the above steps, constantly approaching the value of pi.
By this method, Zu Chongzhi finally got the value of pi as 3. 14 15926, accurate to 7 decimal places. This result is nearly 1000 years earlier than that of Europeans, which can be said to be a very amazing achievement.
Zu Chongzhi not only made outstanding achievements in the study of pi, but also made important contributions in other fields of mathematics. He is one of the representatives of ancient mathematics in China, and is known as "the father of mathematics in China". His book "Shu Shu Jiu Zhang" is a classic of China's ancient mathematics, which has had a far-reaching impact on later mathematical research.
Generally speaking, Zu Chongzhi is the first person in the world who can accurately calculate pi to seven decimal places. He used a method called secant to approximate the value of pi by cutting circles continuously. His achievements not only have an important position in the history of Chinese mathematics, but also have a far-reaching impact on the history of world mathematics.