What?
A gram is a measure of mass. A kilometre is a measure of distance. The two measure different things and, according to basic principles of dimensional analysis, conversion from one to the other is not valid.
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1200 square km=1200 square km
1,000 milligrams equal 1 gram. Multiply 1200 grams by 1000. 1200 x 1000 = 1,200,000 mg
1.2 kilograms = 1200 grams
1,200 miles = 1,931.2128 kilometers
1000m = 1km 1200m = 1.2km