'pi' is an IRRATIONAL number. Casually this means the decimals go to infinity, and the digits are not in any regular order.
Modern pocket calculators will give 'pi' to nine decimal places.
Hence pi ~ 3.141592654....
For school work pi = 3.14 or 3.1416
For find engineering pi = 3.1416 (That is to 'ten thousands of a unit'.
'Supa Dupa' computers have calculated 'pi' to 50 billions places and still going.
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3,141 592 653 589 793 238 462 643 383 279 502 884 197 169 399 375 105 820 974 944 592 307 816 406 286 208 998 628 034 825 342 117 067
1.2411 trillion digits (1,241,100,000,000) digits of pi have been dicovered.
3.14159265358979323864062384626238832795028841971693939937510582097494459230781640628620898628034825342117067 These are the hundred digits of pi
Because Pi is known to be an irrational number it means that the digits never end or repeat in any known way. But calculating the digits of Pi has proven to be an fascination for mathematicians throughout history. Some spent their lives calculating the digits of Pi, but until computers, less than 1,000 digits had been calculated. In 1949, a computer calculated 2,000 digits and the race was on. Millions of digits have been calculated, with the record held (as of September 1999) by a supercomputer at the University of Tokyo that calculated 206,158,430,000 digits. (first 1,000 digits). However, learning 3.141, is all that is necessary. But you can go on and on, to infinity, and never find the exact circumference of a circle. I have only memorized 205 digits of pi; and yes I do use it to find the circumference of a circle.
The first 55 digits of pi after the decimal point are: 3.1415926535897932384626433832795028841971693993751058209
pi= 3.14159265358979323846264338327950288