Pi is the ratio of the circumference of a circle to its
diameter.
For example if the circumference was 22 and the
diameter 7, pi would be calculated by 22/7.
It was observed
by the ancient Greek mathematecians that this number would always be 3.14, thus you can
call it a constant.
The number is also in irrational
number. The numbers right of the decimal go on indefinitely and do not repeat
themselves.
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