There are 1000 millimetres in a metre. When it comes to area, the difference between units gets squared as do the units. i.e. 1000^2 is 1,000,000. Therefore there are 1 million mm^2 in a metre squared.
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1/4 acre = about 1,1011.7 meters squared. (1,011.71411 meters squared)
156 meters squared = 24,336 meters.
196 meters squared
100cm squared = 0.01 metres squared
1 sq kilometer = 1000000 sq meters