If the length of a side of the square is S units then the diagonal is S*sqrt(2) units in length.
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It depends on the relationship between the triangle and the square!
If you take the square of the long side and add it to the square of the short side, you get the diagonal (hypotenuse) squared. Then just find square root of that. For example, if short side is 3cm and long side is 4cm: 9 + 16 = 25, so the diagonal would be the square root of 25 ie. 5.
You do a^2 x b^2 = c^2 where a=the base, b= the height and c=the diagonal.More info: take the square of "a" and the square of "b" and multiply them together, then take your answer and find the square root of it, that is "c" (the diagonal).
To calculate the diagonal, use the Pythagorean Theorem.6^2 + 6^2 = x^236 + 36 = x^272 = x^2sqrt72 = xx = 8.485.....
14 The ratio of the side of a square to the diagonal is 1.4.