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The answer depends on the angle between the 9 ft length and the 21 ft length.

If the angle between the two is x, then

(diagonal)2 = [9 + 21cos(x)]2 + [21sin(x)]2 = 522 + 378*cos(x).

Therefore, 522-378 ≤ diagonal2 ≤ 522 + 378

that is 144 ≤ diagonal2 ≤ 900

or 12 ≤ diagonal ≤ 30

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