Posted by jane on Thursday, November 12, 2009 at 9:26pm.
already answered, but once more:
3km x 200m x5
= 3km x .2km x 5
= 3 (km)^2
or
3km x 200m x5
= 3000m x 200m x 5
= 3000000 m^2
but 1000000 m^2 = 1 (km)^2
so we have 3 (km)^2
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