As early as 1700 years ago, Liu Hui, an ancient Chinese mathematician, calculated the pi as 3. 14 1024 by secant method. After Liu Hui, Zu Chongzhi, an ancient Chinese mathematician, made great progress in the derivation of pi.
Zu Chongzhi calculated * * * and got two numbers: one is abundance number (approximate value of surplus), which is 3.1415927; The other is (nǜ) number, which is 3. 14 15926, and the true value of pi is just between the remaining two numbers.
Zu Chongzhi also adopted two fractional values: one is 22/7 (about 3.14); The other is 355/ 1 13 (approximately equal to 3. 14 15929). The density obtained by Zu Chongzhi is at least 1000 years earlier than that obtained by foreign mathematicians.
Pi characteristic
The numerical calculation of pi is so accurate that it has little practical significance. A dozen pi values used in modern science and technology are enough. If the Hubble volume is calculated by using the 39-bit precision pi value, the error is less than the volume of an atom.
In the past, people calculated pi to explore whether pi circulated decimals. Since Lambert proved that pi is irrational in 176 1 and Lin Deman proved that pi is transcendental in 1882, the mystery of pi has been uncovered.
π plays a very important role in many fields of mathematics.