1 km = 105 cm so 1 sq km = (105)2 = 1010 or 10 billion sq cm.
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1 cm = 10-5 km so 1 sq cm = 10-10 sq km so 10 cm = 10-9 sq km ie a billionth of a sq km.
320 sq. ft. equals: 35.56 sq yd 297289.73 sq cm 29.73 sq m 0.01 sq km 46080 sq inch
3716121.6 sq. cm 371.61216 sq. meters 0.00037 sq. km 576000 sq. inch 444.44444 sq. yard 0.00014 sq. miles 0.03716 hectares 0.09183 acres
There are 7 continents as follows - Africa - 30,300,000 sq km Antarctica - 14,000,000 sq km approx Asia - 44,700,000 sq km Australia - 7,686,850 sq km Europe - 9,940,000 sq km North America - 24,360,000 sq km South America - 17,770,000 sq km
0.440 sq km, approx.