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Square kilometre (International spelling as used by the International Bureau of Weights and Measures) or square kilometer (American spelling), symbol km2, is a multiple of the square metre, the SI unit of area or surface area. 1 km2 is equal to: * 1,000,000 square metres (m2) * 100 hectares (ha) It is also approximately equal to: * 0.3861 square miles 〔There are 0.386102159 international square miles in a square kilometer while there are 0.386100614 US Survey square miles in the same measure. This is because the US Survey measures are very slightly larger than the international measures. 〕 * 247.1 acres 〔There are 247.105381467 international acres in a square kilometre while there are only 247.104393047 of the very slightly larger US Survey acres. 〕 Conversely: *1 m2 = 0.000001 (10−6) km2 *1 hectare = 0.01 (10−2) km2 *1 square mile = 〔An International square mile equals 2.58998811|km2 while the slightly larger US Survey square mile equals 2.58999847|km2. 〕 *1 acre = about 〔1 acre (International) = while 1 acre (US Survey) = 〕 The symbol "km2" means (km)2, square kilometre or kilometre squared and not k(m2), kilo–square metre. For example, 3 km2 is equal to = 3,000,000 m2, not 3,000 m2. ==Examples of areas of 1 square kilometre== 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Square kilometre」の詳細全文を読む スポンサード リンク
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