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The diagonal of a square with side 1 unit is \(\sqrt{2}\) units long. A student wants to write it as a ratio of two integers. Which conclusion is correct?

Answer and explanation

Correct answer: This is not possible because \(\sqrt{2}\) is irrational.

By Pythagoras’ theorem, \(d^2=1^2+1^2=2\), so \(d=\sqrt{2}\). It cannot be written as a ratio of integers. If both terms are even, the fraction is not in lowest form. Exam tip: write \(d^2\) first for a square’s diagonal.

Related tags

Number SystemsIrrational NumbersSquare Root 2Pythagoras TheoremProof Of IrrationalityProof Of Irrationality Of Square Root 2 And Square Root 3MathematicsClass 9 Mcq

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