There is no general formula. You could use basic trigonometry.
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You measure it. If you know the lengths of two other sides, as well as the angle between them, you can also use the law of cosines.
If they are the dimensions of a rectangle then use Pythagoras' theorem to find the length of the diagonal.
The square has a diagonal measurement of: 1.13 km
Two of them
To find the diagonal measurement of a rectangle with dimensions 32 units by 26 units, you can use the Pythagorean theorem. The diagonal (d) can be calculated as (d = \sqrt{(32^2 + 26^2)}). This results in (d = \sqrt{(1024 + 676)} = \sqrt{1700} \approx 41.23) units. Therefore, the diagonal measurement is approximately 41.23 units.
A quadrilateral in which diagonal are not congruent and only larger diagonal is perpendicular bisector of smaller diagonal then it is known as kite -- Mohan S. Vighe