None.
12 and 17 are both pure (dimensionless) numbers and so their product is also a pure number.
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(12 X 2) / (17 X 2), (12 X 3) / (17 X 3), (12 X 4) / (17 X 4), and so on...
17 x 12 = (10 x 12) + (7 x 12) = 120 + 84 = 204
Need a measure in the third dimension before you can get an answer.
17
12' x 10'