The perimeter of a square is 56 cm What is the approximate length of its diagonal?

A square has four equal sides, so each side is 56 ÷ 4 = 14 cm. Its diagonal is the hypotenuse of a right triangle with legs 14 cm and 14 cm, so its length is √(14² + 14²) = 14√2 ≈ 19.8 cm. Therefore, the approximate diagonal length is 19.8 cm.

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