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For a square with an area of 2 cm², Aarav says, “Since the area is a rational number, the perimeter of the square must also be rational.” Which is the correct evaluation of Aarav’s statement?

Answer and explanation

Correct answer: irrational

The side is \(s=\sqrt{2}\) cm because \(s^2=2\). Thus, the perimeter is \(4s=4\sqrt{2}\) cm, which is irrational. \(2\sqrt{2}\) represents only two sides. Exam tip: the square root of a positive integer is rational only when the integer is a perfect square.

Related tags

Irrational NumbersSquare RootsNumber SystemsPerimeter ApplicationMathematical ReasoningProof Of Irrationality Of Square Root 2 And Square Root 3MathematicsClass 9 Mcq

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