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A square has a side length of 5 cm. What type of number is the length of its diagonal?

Answer and explanation

Correct answer: अपरिमेय संख्या

The diagonal of a square is given by side × \(\sqrt{2}\), so its length is \(5\sqrt{2}\) cm. Since \(\sqrt{2}\) is irrational and 5 is a non-zero rational number, \(5\sqrt{2}\) is also irrational. Therefore, option B is correct. Exam tip: multiplying an irrational number by a non-zero rational number keeps the result irrational.

Related tags

Real NumbersIrrational NumbersSquare DiagonalNumber ClassificationClass 9 MathematicsNumber SystemsMathematicsClass 9 Mcq

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