The question cannot be answered without information about what the shape is. It could be triangular or rectangular, or one of several other shapes.
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12 x 16 mm is a length of 192 mm which is approx 7.6 inches. 12 mm x 16 mm is measure of an area in 2 dimensional space and that cannot be converted to inches - which is a measure of length in 1 dimensional space.
Area = 11*12 = 132 square mm
A sheet of A4 paper has an area of 1/16 square metres. Its dimensions are approximately 297 mm x 210 mm.
12 mm. 12 mm.
111.6 A= 0.5 x 18.6 millimeters x 12.0 millimeters