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Which of the following is an irrational number?

Answer and explanation

Correct answer: \(\pi\)

\(\pi\) is irrational because it cannot be expressed as a ratio \(\frac{p}{q}\) of two integers with \(q\neq 0\). In contrast, \(0.25=\frac{1}{4}\), \(\sqrt{49}=7\), and \(-7\) are all rational numbers. Exam tip: the square root of a perfect square is rational, whereas \(\pi\) and, generally, the square root of a non-perfect square are irrational.

Related tags

Real NumbersIrrational NumbersRational NumbersNumber SystemsClass 9 MathematicsMathematicsClass 9 Mcq

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