Anything you want, so long as (Length in inches)2 + (Width in inches)2 = 1,764
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The diagonal is 221.2 inches long.
If they are the dimensions of a rectangle then use Pythagoras' theorem to find the length of the diagonal.
134.6 feet
Using Pythagoras' theorem the length of the diagonal is 20 feet
15 and 20 inches because these dimensions comply with Pythagoras' theorem and the area of the rectangle.