I assume that you refer to a 12 ft x 12 ft 8 in square.
The length of the diagonal is determined easily suing Pythororas's therem:
Diagonal = sqrt[122 + (128/12)2] feet = sqrt(304.4... ) ft = 17.448 ft approx.
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The diagonal measurement of an 8 ft square is: 11.31 feet.
46.648 ft
7 times the square root of 2 feet
Use Pythagoras' therorem to find the diagonal of the rectangle which is 12 times the sq rt of 13
The answer depends on the measurement units used for "12x12": feet, metres, yards or some exotic measure? Without that information the question cannot be answered.