What are the numbers of pi?

Answer 1

Pi is a transcendental number that relates the diameter of a circle to its circumference

(C = pi * d).

There are an infinite number of digits. The first 100 decimal places are:

3.1415926535897932384626433832795028841971693993751058209749445923078164062862089986280348253421170679821480865132823066470...

Pi has an infinite number of digits and no endpoint. There are no repeated

sequences as with fractions because pi is an irrational number, the relationship

between a circle's diameter and its circumference.

Pi has been calculated to more than 10 trillion digits. Using 3.1416 will result in

only a 0.002 % difference from the longer forms. Depending on the degree of

accuracy sought, pi can be approximated as:

3.14

3.1416

3.1415926535

The fraction 22/7 is often used for pi. Obviously, it's not the 'correct' value. But

it's easy to use, and it turns out to give results that are only about 0.04% wrong

compared to using the 'true' value for pi.

Pi does not have "numbers"; it is a single number. The individual symbols (in the

decimal representation) are called "digits", not "numbers".

It is believed (though not yet proved) that every integer is in the decimal

expansion of pi an infinite number of times. E.g. 5358979 is found near the

beginning and 79 occurs three times just in the first 100 digits.