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Discover LudwigThe phrase "square kilometers" is correct and usable in written English.
You can use it to refer to a measure of area, for example, "The state of Texas covers an area of 268,581 square kilometers."
Dictionary
square kilometers
noun
Plural of square kilometer
Exact(60)
"In Baghdad, our area of operations was 750 square kilometers, and now we were looking at 20,000 square kilometers," General Dempsey said.
The 50 nuclear power stations required would occupy a more modest 50 square kilometers.
China has now created over 4 square kilometers (1.5 square miles) of artificial landmass," he said.
It is the largest of the Izu Islands, at 91 square kilometers, or 35 square miles.
China has now created over 4 square kilometers [1.5 square miles] of artificial landmass".
# units = square kilometers.
Grid is in square kilometers.
Towers can vary in their coverage areas from 5 square kilometers to 100 square kilometers.
It has a landmass of 118 484 square kilometers.
In fact its surface is 3640 square kilometers.
Wind energy covered a land area about the size of Delaware (6400 square kilometers), while biofuel crops and forests would cover Connecticut (about 14,000 square kilometers).
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com