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A student says, “If the area of a square is rational, then its side must also be rational.” Which of the following examples disproves the statement?

Answer and explanation

Correct answer: Area \(2\,\text{cm}^2\), side \(\sqrt{2}\,\text{cm}\)

For a square, \(s^2=A\). When \(A=2\), the side is \(s=\sqrt{2}\), which is irrational. Hence, a rational area need not give a rational side. In exams, first take the square root of the area.

Related tags

Number SystemsIrrational NumbersSquare Root 2Proof Of IrrationalityMathematical ReasoningProof Of Irrationality Of Square Root 2 And Square Root 3MathematicsClass 9 Mcq

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