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The area of a square garden is \(18\,\text{m}^2\). Which conclusion about the length of its side is correct?

Answer and explanation

Correct answer: it is irrational

The side of the square is \(\sqrt{18}=\sqrt{9\times2}=3\sqrt{2}\,\text{m}\). Since \(\sqrt{2}\) is irrational, \(3\sqrt{2}\) is also irrational. Option B has the correct length but the wrong classification. Exam tip: first extract perfect-square factors from a square root.

Related tags

Irrational NumbersSquare RootsNumber SystemsGeometry ApplicationSurd SimplificationMathematicsClass 9 Mcq

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