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A square garden has an area of 2 square metres. Which statement correctly gives the length of its side and identifies it as rational or irrational?

Answer and explanation

Correct answer: √2 metres and irrational

The area of a square equals side², so its side is \(\sqrt{2}\) metres. Since 2 is not a perfect square, \(\sqrt{2}\) cannot be expressed as a ratio of two integers and is therefore irrational. Option A is incorrect because a side of 2 metres would give an area of 4 square metres. Exam tip: To find the side of a square, take the square root of its area and check whether the area is a perfect square.

Related tags

Real NumbersIrrational NumbersSquare RootsNumber SystemsClass 9 MathematicsMathematicsClass 9 Mcq

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