Both of yours are acceptable, but not the expected native structure, which would be this: This land was only 100 meters square / only a 100-meter square.
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lucas21che meaning of "This land was only 100 meters square" and "This land was only a 100-meter square" is different, right? (I think the latter means 10,000 meters square which is 100 times as wide as the former)Ah, yes—I think you're right!