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Surface area of a spere = 4πr2

Given, earth is a sphere of radius 6370 km.

Surface area of earth = 4 × (22/7) × 63702

Surface area of earth = 510109600 km2

Now, three-fourth of the earth’s surface is covered by water

Area covered by land = 1/4 × 510109600 = 127527400 km2

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