The number Pi (π) is a mathematical constant, it is equal to ≈3.14.

The number Pi is used to measure the circumference of a circle. It is used in various fields of science: mathematics, physics, statistics, engineering.

π is an irrational number, meaning that there are an infinite number of digits after the decimal point, and they do not create repetitions. Therefore, it is impossible to write the number in full; instead, an approximate value is used. As a rule, the number is reduced to hundredths: 3.14. For advanced calculations, ten digits after the decimal point are used: 3.1415926535.

any color but especially purple

pies

gloomy, stern, fair, smart, grumpy. Why does he need a character anyway?

In 1647, the mathematician Outrade called the circumference of a circle the Greek letter Pi, from the first letter of the word periphery. In 1706, the English teacher William Jones, in his work Review of the Achievements of Mathematics, already called the ratio of the circumference of a circle to its diameter the letter π. And the name was fixed by the mathematician Leonard Euler.

It's about 4,000 years old. The Babylonians used it for about 4,000 years... and they still use it today.

Euler's identity is a special case of Euler's formula when x

π, a famous identity relating three fundamental mathematical constants. The exponential function ez can be defined as the limit of the sequence (1 + z/N)N as N tends to infinity, and so eiπ is the limit of (1 + iπ/N)N. Each frame of this animation shows the numbers (1 + iπ/N)k, where k runs from 0 to N and N takes various increasing values ​​from 1 to 100. e i π

1 , e^{i\pi }=-1,} Where

e — the number e, or the base of the natural logarithm, i — imaginary unit, π — pi, the ratio of the circumference of a circle to its diameter.

3,1415926535 8979323846 2643383279 5028841971 6939937510 5820974944 5923078164 0628620899 8628034825 3421170679 8214808651 3282306647 0938446095 5058223172 5359408128 4811174502 8410270193 8521105559 6446229489 5493038196 4428810975 6659334461 2847564823 3786783165 2712019091 4564856692 3460348610 4543266482 1339360726 0249141273 7245870066 0631558817 4881520920 9628292540 9171536436 7892590360 0113305305 4882046652 1384146951 9415116094 3305727036 5759591953 0921861173 8193261179 3105118548 0744623799 6274956735 1885752724 8912279381 8301194912 9833673362 4406566430 8602139494 6395224737 1907021798 6094370277 0539217176 2931767523 8467481846 7669405132 0005681271 4526356082 7785771342 7577896091 7363717872 1468440901 2249534301 4654958537 1050792279 6892589235 4201995611 2129021960 8640344181 5981362977 4771309960 5187072113 4999999837 2978049951 0597317328 1609631859 5024459455 3469083026 4252230825 3344685035 2619311881 7101000313 7838752886 5875332083 8142061717 7669147303 5982534904 2875546873 1159562863 8823537875 9375195778 1857780532 1712268066 1300192787 6611195909 2164201989

ζ(3) — ρ — √2 — √3 — √5 — ln 2 — φ,Φ — ψ — α,δ — e — eπ and π

In the state of Indiana (USA) in 1897 an attempt was made to pass the Pi Bill, which would have set its value to 3.2[51]. This bill did not become law due to the timely intervention of a professor from Purdue University, who was present in the state legislature during the consideration of this law;

There is a feature film named after the number pi;

The unofficial holiday "Pi Day" is celebrated annually on March 14, which in the American date format (month/day) is written as 3.14, which corresponds to the approximate value of the number π. It is believed[52] that the holiday was invented in 1987 by San Francisco physicist Larry Shaw, who noticed that on March 14 at exactly 01:59 the date and time coincided with the first digits of the number pi = 3.14159; Another date associated with the number π, is July 22, which is called "Pi Approximation Day" because in the European date format this day is written as 22/7, and the value of this fraction is a rational approximation of the number π.

American progressive metal band After The Burial recorded the song Pi — The Mercury God of Infinity, in which the rhythm guitar and bass drum part is based on the higher digits of the decimal fraction of the number π.

In 1981, the French space rock band Rockets released the music album "Pi 3.14". François Arago wrote in his Astronomy in Common Understanding[53]:

Let's see how accurately we can calculate the length of a circle, the radius of which is equal to the average distance of the Earth from the Sun (150,000,000 km), using the digits of pi (the number pi). If we take 18 digits for pi, then an error of one unit in the last digit will entail an error of 0.0003 millimeters in the length of the calculated circle; this is much less than the thickness of a hair.

We have taken 18 digits of pi. It is easy to imagine what an unimaginably small error we would have made, given the enormous size of the circle being calculated, if we had used all of its known digits for pi. From what has been said it is clear how mistaken are those who think that the sciences would change their form and their applications would benefit greatly from finding the exact pi if it existed.

So, even for astronomy, the science that resorts to the most precise calculations, a completely precise solution is not required...

measure the diameters of circles

He is happy that he is respected and used. He treats people calmly, that is, not hostilely

he can kill someone... he himself is immortal