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There is no general formula. You could use basic trigonometry.

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9y ago
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9y ago

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.

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Q: How do you find the diagonal measurement of a quadrilateral?
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Related questions

How do your find the diagonal measurement for 120 by 150?

If they are the dimensions of a rectangle then use Pythagoras' theorem to find the length of the diagonal.


Find out What is quadrilateral whose diagonal or perpendicular to each other but unequal?

It is a rhombus or a kite


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Any quadrilateral that is not a parallelogram can have only one diagonal that is bisected by the other.


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How do you find the length of the diagonals of an irregular quadrilateral?

You would have to consider a triangle formed by one diagonal and two sides of the quadrilateral. If you know the lengths of these sides, and the measure of the angle between them, you can use the cosine law to find the diagonal. c2 = a2 + b2 -2ab(cosC)


If one diagonal of quadrilateral bisects the other then the quadrilateral is a parallelogram?

No. It could be a kite.


If one diagonal of a quadrilateral bisects the other when is the quadrilateral a parallelogram?

In this case, the quadrilateral is sometimes a parallelogram.


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Two of them


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