314.16 square k,.
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The area of a circle with a radius of 10 km is πr^2, where r is the radius. In this case, the area would be approximately 314.16 square kilometers.
The surface area of the Rocky Mountains is approximately 523,000 square kilometers.
Antarctica has a total area of approximately 14 million square kilometers, making it the fifth largest continent in terms of area.
A batholith is a pluton exposed across more than 100 square km of Earth's surface. An average batholith is about 10 km thick, but can be up to 20 km thick. A stock is very similar to a batholith, but with less than 100 square km exposed.
from Wikipedia: http://en.wikipedia.org/wiki/Continental_United_States The 48 states and D.C. together have an area of 3,119,884.69 square miles (8,080,464.25 km²). Of this, 2,959,064.44 sq mi (7,663,941.71 km²) is land, comprising 83.65% of U.S. land area. Officially, 160,820.25 sq mi (416,522.38 km²) is water area, comprising 62.66% of the nation's water area. Its 2000 census population was 279,583,437, comprising 99.35% of the nation's population. Its population density was 94.484 inhabitants/sq mi (36.48/km²), compared to 79.555/sq mi (30.716/km²) for the nation as a whole. Entered into WikiAnswers Sept 9, 2009
Austria's total land area is approximately 83,879 square kilometers.