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Which length in a square root spiral is usually irrational?

Answer and explanation

Correct answer: \(\sqrt{8}\)

\(\sqrt{8}=2\sqrt{2}\), and \(\sqrt{2}\) is irrational; therefore, \(\sqrt{8}\) is irrational. In contrast, \(\sqrt{1}=1\), \(\sqrt{4}=2\), and \(\sqrt{9}=3\) are rational because 1, 4, and 9 are perfect squares. Exam tip: simplify the number under the root using a perfect-square factor, for example \(8=4\times2\), before deciding.

Related tags

Number SystemsSquare Root SpiralIrrational NumbersSquare RootsPerfect SquaresMathematicsClass 9 Mcq

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