Jisho

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へいほう 平方キロメートル
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Noun
1. square kilometer; square kilometre​
Wikipedia definition
2. Square kilometre​Square kilometer, symbol km, is a decimal multiple of the SI unit of surface area, the square metre, one of the SI derived units. 1 km is equal to: 1,000,000 m 100 ha 0.386302 square miles 247.105381 acres Conversely: 1 m = 0.000001 (10) km 1 hectare = 0.01 (10) km 1 square mile = 2.58998811km 1 acre = 0.004047km, 0.4047ha or 4047 m 2.47 acres/ha Note: "km" means (km), square kilometre or kilometre squared and not k(m), kilo–square metre.
Read “Square kilometre” on English Wikipedia
Read “平方キロメートル” on Japanese Wikipedia
Read “Square kilometre” on DBpedia

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