Assuming the earth to be a sphere of radius 6370 km, how many square kilometres is area of the land, if three-fourth of the earth's surface is covered by water?

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Solution

In the given problem, let us assume that the earth is a sphere and the radius of the earth is given equal to 6370 km.

The total surface area of earth can be calculated using the formula,

So, the total surface area of earth is equal to 510109600 km².

Now, according to the question three-fourth of the earth’s surface is covered with water. This means that one-fourth of the surface is covered with land.

Therefore, we get,

The area of land covered by water

Therefore the area of earth’s surface covered by land is equal to

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Question 139

Geography Application
Earth's total land is about 148428950 $k m^{2}$ . The land area of Asia is about 30% of this total. What is the approximate land area of Asia to the nearest square kilometre?

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