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A student claims that \(\sqrt{3}\) is rational because its decimal form is 1.732 and \(1.732=\frac{1732}{1000}\). What is the error in the student’s reasoning?

Answer and explanation

Correct answer: 1.732 is only an approximation of \(\sqrt{3}\), not its exact value.

1.732 is a terminating decimal approximation. In fact, \(1.732^2=2.999824\), not 3. Thus \(\frac{1732}{1000}\) is rational, but it is not equal to \(\sqrt{3}\). Exam tip: distinguish an approximate decimal from an exact value.

Related tags

Number SystemsIrrational NumbersSquare Root 3Proof Of IrrationalityDecimal ApproximationCommon MisconceptionsProof Of Irrationality Of Square Root 2 And Square Root 3Mathematics

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