It's the ratio between the circumference of any circle to its diameter.
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No. Pi is a special kind of irrational number called a transcendental number. This means that no power of pi (other than 0), or any combinations of its powers is rational.
pi is a transcendental (a special type of irrational) number whereas 3 is not only rational, but an integer.pi is a transcendental (a special type of irrational) number whereas 3 is not only rational, but an integer.pi is a transcendental (a special type of irrational) number whereas 3 is not only rational, but an integer.pi is a transcendental (a special type of irrational) number whereas 3 is not only rational, but an integer.
You need the formula circumference = pi x diameter pi = 3.14.. This is by the way the definition of the special number pi.
The date can be written as 3.14.15 which are the first digits of pi. That can only happen once every hundred years.
the number 68 is the 2-digit string that apepears latest in the decimal espansion of pi.