what is pi

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  1. π is defined as the ratio of the circumference of a circle to its diameter
    - of course π is an irrational number, thus it cannot be exactly written as a fraction
    π is appr 3.1415926...

    A fraction which has been used for an approximation for π for a long time is 22/7
    A much better one is 355/113, quite easy to memorize because of its nice symmetry.

    Today's calculators have π as a build-in constant and we no longer need that 22/7, which contains a significant error

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