Because it can't be expressed as a fraction
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Like all Irrational Numbers the constant Pi cannot be expressed exactly as a ratio of two integers.
Pi is an irrational number
pi is an irrational number. It is irrational because it cannot be expressed as a ratio of two integers.
The square of pi is an irrational number.
Well, (pi) x (1/pi) = 1 .
pi is an example of an irrational number.