By using Pythagoras:
diagonal2 = side2 + side2
= side2 x 2
=> diagonal = side x √2
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In the simplest case, it is use to find the diagonal length of a unit square.
30 radical 2
The diagonal length of a square with a 900 square foot area is: 42.43 feet.
The diagonal of a unit square, for example, is radical(2).
The diagonal length of a square can be calculated using the formula (d = a\sqrt{2}), where (a) is the length of a side. For a 40x40 square, the diagonal length is (d = 40\sqrt{2}), which is approximately 56.57 units.