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Because it is a non-repeating, non-terminating decimal.

22/7 is often used for pi, but it is only an approximation; there is no fraction that exactly equals pi.

it goes on forever 3.14159265358979323846264338327950288419716.......

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Q: Why is pi considered an irrational number?
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Pi is an irrational number because as a decimal number it is infinite which means it has no terminating ending


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