# Earth's surface

The greater part of the earth's surface (r = 6371 km) is covered by oceans; their area is approximately 71% of the Earth's surface. What is the approximate area of the land?

Result

x =  147918697 km2

#### Solution:

$x=(1-71/100) \cdot \ 4 \pi \cdot \ 6371^{ 2 } = 147918697 \ km^2 = 1.479187\cdot 10^{ 8 } \ km^2$

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