4 km2
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An area of 0.00776 km square equates to 7,760 square meters.
A mile is not a measure of an area so, as asked, the question has no answer. Unfortunately, 150 km squared is ambiguous since it could refer to an area of 150 square kilometres (say 10 km by 15 km) OR an area of the square with sides of 150 km. 150 square km = 57.92 square miles 150 km square = 22500 square km = 8687.3 sq miles = 93.21 miles square.
The square root of 100 km^2 is 10 km.
"1 km" is a distance. It has no area.1 square km = 10,763,910 square feet (rounded)
North Korea: Area = 120538 km^2 = 1.297x10^12 ft^2 South Korea: Area = 98480 km^2 = 1.06x10^12 ft^2 The total of Korea: Area = 219018 km^2 = 2.357x10^12 ft^2