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How to find the length of the diagonal of a rectangle

Let, length of the diagonal of a rectangle be d and let the angle between the diagonal and a side of the rectangle (say length) be θ. Then, length of that side of the rectangle = (d * cos θ). And

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3 Ways to Find the Measurement of the Diagonal Inside a

Simply plug the length and the diagonal into the formula above. Remember, the diagonal is always longer than the length of the rectangle. For example, if the length is 8 inches and the diagonal is 10
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Diagonal of a Rectangle. Calculator

A diagonal of a rectangle cuts the rectangle into 2 right triangles with sides equal to the sides of the rectangle and with a hypotenuse that is the diagonal. All you need to do is use the pythagorean theorem: \ (\displaystyle a^2+b^2=c^2\)

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