1 kilometer = 1,000 meters (1km x 1 km) = 1 km2 = (1,000m x 1,000m) = 1,000,000 m2 (one million square meters)
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A square metre is a unit of area. A metre is a unit of length. The two units are therefore incompatible.
Since each kilometer = 1000 meters, one square kilometer = 1000 X 1000 = 1 million square meters.
there is 10 000 square meters in a hectare. 10 000 square meters equals 0.01 square kilometers
Well, darling, 400,000 square meters is equal to 0.4 square kilometers. So, to answer your question, there are 0.4 squared kilometers in 400,000 square meters. Math doesn't have to be a headache, honey!
The word sqaure has only 1 syllable.