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Why is it equal to 180 degrees?
According to the mathematical formula, the circumference of a circle is equal to twice the radius multiplied by the pi. Therefore, the circumference of a circle with a radius of 1 is twice the pi, and the degree of a circle is 360 degrees, so the pi twice is 360 degrees, and the pi is equal to 180 degrees. ?

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.