There is no such thing as a milimeter. Millimetre, yes. Even millimeter (if you happen to be American).
Next, there are no units given for 9 x 12. It is, therefore, impossible to tell whether you mean 9 nanometres * 12 nanometres or 9 light years by 12 light years or something in between those - or possibly beyond.
Finally, a millimetre is a measure of distance in 1-dimensional space. 9 x 12 appears to be a measure in 2-dimensional space. A measure in 1-d cannot be converted to a 2-d measure.
I recommend that you reconsider your question and ask it, providing relevant units etc, and in a way that makes some sense.
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No. 12 millimeters is greater than 9 millimeters just as 12 inches is greater than 9 inches.
x X 9 = 12 x = 12/9 x = 4/3 The answer!!!!
x/9 = 12 Therefore, x = 9 x 12 x = 108
111.6 A= 0.5 x 18.6 millimeters x 12.0 millimeters
12 -9 + x = 3 -9 + x + 9 = 3 + 9 x = 3 + 9 x = 12