The answer is given in the question: 100mm
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it should be 100,000,000 mm 100mm=1m 10,000mm=10m if square, it is 10,0002mm=100,000,000mm
100mm is 10cm
50 square mm because 12mm 12 meter 1mm 1m 100mm= 1m
Imagine you have a block of wood that is 1 cubic metre [ 1 cm ]. If you slice that into 10 slices by 100mm thick you will now have 10 square metres of wood. Now try that with concrete. You want to put in a drive-way 10 mtrs long by 2 mtrs wide by 100mm thick, that is 20 sq mtrs by 100mm = 2 cm of concrete.
The area of square is : 100.0