Square kilometre

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The square kilometre (square kilometer in American spelling; symbol: km2) is a multiple of the square metre, the SI unit of area or surface area. In the SI unit of area (m2), 1 km2 is equal to 1M(m2). 1 km2 is equal to: 1,000,000 square metres (m2) 100 hectares (ha) It is also approximately equal to: 0.3861 square miles 247.1 acres Conversely: 1 m2 = 0.000001 (10−6) km2 1 hectare = 0.01 (10−2) km2 1 square mile = 2.5899 km2 1 acre = about 0.004047 km2 The symbol "km2" means (km)2, square kilometre and not k(m2), kilo–square metre. For example, 3 km2 is equal to 3×(1,000m)2 = 3,000,000 m2, not 3,000 m2.

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