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The area of a square is 18 cm². Which option correctly gives its side length and perimeter?

Answer and explanation

Correct answer: भुजा / side: \(3\sqrt{2}\) cm; परिमाप / perimeter: \(12\sqrt{2}\) cm

The area of a square is (side)². Hence, side = \(\sqrt{18}=\sqrt{9\times2}=3\sqrt{2}\) cm. Its perimeter is 4 × side = \(4\times3\sqrt{2}=12\sqrt{2}\) cm, so option B is correct. In option D, \(\sqrt{18}\) cm is a correct form of the side, but the stated perimeter is incorrect. Exam tip: For a square, first find the side from the area and then multiply the side by 4 to obtain the perimeter.

Related tags

Real NumbersIrrational NumbersSquare AreaPerimeterSquare RootsClass 9 MathematicsNumber SystemsMathematics

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