rational because you can simplify the square root to 3 which is the quotient. Pi is probably the most well known irrational number out there.
Improved Answer:-
Pi is an irrational number because like all Irrational Numbers they can't be expressed as fractions.
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pi is an example of an irrational number.
It is rational because it can be expressed as -516/100. An irrational number cannot be expressed as such. For example , PI is irrational.
Negative pi
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 because it can't be expressed as a fraction.