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A student claims that the diagonal of a square of side 1 unit is a rational number. Which argument correctly disproves this claim?

Answer and explanation

Correct answer: If the diagonal is \(m/n\) with \(m,n\) coprime, then \(m^2=2n^2\) shows that both \(m\) and \(n\) are even, which is impossible.

The diagonal is \(\sqrt{2}\). Assuming \(\sqrt{2}=m/n\) in lowest terms gives \(m^2=2n^2\). Put \(m=2k\); then \(n\) is also even, contradicting coprimality. Option C is wrong because an infinite decimal may repeat. Exam tip: state the lowest-terms assumption first.

Related tags

Number SystemsIrrational NumbersSquare Root 2Proof By ContradictionParityClass 9 MathematicsProof Of Irrationality Of Square Root 2 And Square Root 3Mathematics

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