It is the longest distance between two opposite corners of the square and it is possible to use Pythagoras' theorem to find the length of the diagonal
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As a square has right angles, the diagonal forms a right triangle with two of the sides of the square. Therefore use Pythagoras: diagonal² = side² + side² → diagonal² = 2side² → diagonal = side × √2 Therefore to find the length of the diagonal of a square, multiply the side length of a square by the square root of 2.
The square's diagonal is 11.314 cm
The diagonal of a square = the length of one side x the square root of 2 (approx 1.414)
The diagonal is ~16.97 units.
The diagonal is 14.142 feet.