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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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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