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Pi never ends. That's why it's so special.
The date can be written as 3.14.15 which are the first digits of pi. That can only happen once every hundred years.
You need the formula circumference = pi x diameter pi = 3.14.. This is by the way the definition of the special number pi.
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.
It's the ratio between the circumference of any circle to its diameter.