pi is an irrational number because it cannot be expressed as a ratio of two integers. In fact, it is a transcendental number, but that is not relevant here.
3.14 is a rational approximation to pi. It is not equal to pi.
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The square of pi is an irrational number.
No. sqrt(2)/pi is not rational.
pi is an irrational number. It is irrational because it cannot be expressed as a ratio of two integers.
In general, no. It is possible though. (2pi)/pi is rational. pi2/pi is irrational. The ratio of two rationals numbers is always rational and the ratio of a rational and an irrational is always irrational.
It is rational because it can be expressed as -516/100. An irrational number cannot be expressed as such. For example , PI is irrational.