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A square-shaped park has each side measuring 6 metres. What is the straight-line distance from one corner to the opposite corner?

Answer and explanation

Correct answer: \(6\sqrt{2}\) m

Using the Pythagorean theorem for the right triangle formed by two sides of the square, \(d^2=6^2+6^2=72\). Hence, \(d=\sqrt{72}=6\sqrt{2}\) metres, so option C is correct. Option A is only the side length, while option B is the sum of two sides, not the diagonal. Exam tip: the diagonal of a square is side \(\times\sqrt{2}\); therefore, this diagonal is also an irrational real number.

Related tags

Real NumbersIrrational NumbersSquare DiagonalPythagorean TheoremClass 9 MathematicsNumber SystemsMathematicsClass 9 Mcq

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