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Assuming the earth to be a sphere of rad...

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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CSA of earth`=4pir^2`
`=4*22/7*6370*6370cm^2`
CSA of land`=1/4` of CSA of earth
`=1/4*4*22/7*6370*6370`
`=127527400km^2`.
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