But everyone who has read the book knows that I am a magical number, and some paranoid people are more and more proud of being able to recite more numbers after the decimal point.
If a player recites me accurately from beginning to end on a program like Super Brain, he must be the champion.
I was born in 1706. Mathematician william jones mentioned me for the first time in his math textbook Introduction to New Mathematics.
Because Greek π ε ρ φ ρ ε ρ α represents periphery, region, circumference, etc., pi is represented by the initial π.
But the problem is that william jones is not a big coffee, so I didn't attract much attention in the field of mathematics.
1748, the great mathematician Euler's masterpiece Introduction to Infinitesimal Analysis was published. He suggested π for pi, so I went on a hot search and became famous.
? The picture comes from the internet.
As early as BC 1900, the ancient Babylonians began to notice that the ratio of circle to diameter was constant, and they calculated that the value was about 25/8=3. 125.
The ancient Egyptians in the same period also indicated that pi was equal to the square of the score 16/9, which was about 3. 1605. Paradoxically, the ratio of circumference to height of the pyramids built earlier is equal to twice the pi, which is exactly equal to the ratio of circumference to circle radius.
According to the Bhagavan Book of Jainism in ancient India, pi is equal to the score of 339/ 108, which is about 3. 139.
China ancient books recorded that "the diameter of a circle is one and three", that is, π= 3.
These early pi values are generally estimated by measuring the circumference of a circle, then measuring the diameter of the circle and dividing it.
In the 3rd century BC, Archimedes, a great mathematician in ancient Greece, was the first to give a scientific method for calculating pi: the perimeter of a regular polygon inscribed (or circumscribed) in a circle can be accurately calculated. With the increase of the number of sides of a regular polygon, it will be closer to the circle, so the perimeter of the polygon will be closer to the circle.
He calculated himself that it was a regular 96-sided polygon, and got 223/7 1 < Pi < 22/7, that is, the value of Pi was between 3. 140845 and 3. 14857.
These are quite different from my exact values, and I didn't show my true colors until a god-like man appeared.
? The picture comes from the internet.
Around 480 AD, Zu Chongzhi, a mathematician in China's Southern and Northern Dynasties, further obtained the result accurate to seven decimal places on the basis of his predecessor Liu Hui's "Circumcision" more than 200 years ago, giving an insufficient approximation of 3. 14 15926 and an excess approximation of 3.14/kloc-.
In the next 800 years, the value of pi calculated by Zu Chongzhi was the most accurate.
With the development of science and technology and the appearance of calculus, my figure has been lengthened a lot. And the emergence of electronic computers, let me hide.
In your human history, there has never been such a fanatical numerical calculation contest for a mathematical constant.
However, this is also an interesting place for you humans.
If you buy a dish and pay by RMB or mobile phone, you only need to calculate it to two decimal places; In daily life, it is generally enough to take me as 3. 14 16; In the field of science and technology, there are only a dozen; Even if we want to calculate the size of Hubble volume, we only need to be accurate to 39 digits, and the error will not exceed the volume of an atom.
The picture comes from the internet.
In 2009, the US House of Representatives formally passed a non-binding resolution, which designated March 14 as "pi day".
Of course, the best date to commemorate me should be 3141May 9 at 2: 06: 05.