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Let d = diagonal, l = length, w = width
Since we know that the diagonal of the rectangle splits the rectangle into two right angle triangles, being the hypotenuse of both right angle triangles.
To compute it's length, we'll apply the Pythagorean identity:
d^2 = l^2 + w^2
d^2 = 64 + 25
d^2 = 89
d = sqrt 89 units
We'll reject the negative value, since a dimension cannot be negative.
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