On the basis of Liu Hui, Zu Chongzhi calculated the pi to seven places, between 3. 14 15926 and 3. 14 15927. Later generations named it "Zu Chongzhi Pi" after him, or "Ancestral Rate" for short. It was not until the 5th century A.D./kloc-that Al Cassie, an Arab mathematician, broke this record and got pi = 3.14159265358979325, and the exact number was 17. So it is nearly 1000 years earlier than foreign countries.
Zu Chongzhi's Pioneering Work in the History of Mathematics-"Ancestral Rate"
Zu Chongzhi calculated the true value of pi (π) between 3. 14 15926 and 3. 14 15927, which is equivalent to being accurate to the seventh decimal place and simplified to 3.141. Therefore, Zu Chongzhi was ranked first in the world record association world.
Zu Chongzhi also gave two fractional forms of pi: 22/7 (approximate rate) and 355/ 1 13 (density rate), in which the density rate is accurate to the seventh decimal place. Zu Chongzhi's accurate calculation of pi is a great contribution to China and even the world. Later generations named this accurate calculation "Zu Chongzhi Pi" after him, or "Ancestral Rate" for short.
Pi is widely used, especially in astronomy and calendar. All problems involving circles should be calculated by pi. How to correctly calculate the value of pi is an important topic in the history of mathematics in the world. Ancient mathematicians in China attached great importance to this problem and began to study it very early.
The ratio of the ancient diameter to one week and three weeks was put forward in Parallel Calculation of Weeks and Nine Chapters Arithmetic, and the pi was set at three, that is, the circumference of a circle was three times the diameter. Since then, after successive explorations by mathematicians of past dynasties, the calculated pi value has become more and more accurate.