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Although a country is an area on the curved surface of Earth, it is usually calculated as a "flat" surface. The area can be estimated by multiplying the average north-south "height" of a country by the average east-west width.
For "round" areas such as islands, the area can be estimated as the area of a circle of the same average radius.
The total area of a country may be the sum of several distinct areas such as peninsulas and offshore islands. Also, the area can be divided into land areas and water areas within the country's borders.
Example for Egypt: on the map Egypt appears to be about 730 miles N-S and about 540 miles E-W in width. Multiplying gives 394,200 square miles. This is a only a percent or two from the "official" area of 387,048 square miles.
* In kilometers, the measurement is 1175 km by 870 km = 1,022,250 km2.
The official figure is likewise fairly close at 1,002,450 km2.
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