Question

Assume the Earth to be a sphere of radius 6370 km. If 75% of the earth's surface is covered by water, then find how many square kilometres is the area of land.

Explain with complete calculations & justifications.

Points : 20 ☺

Answer 1

surface area of sphere =4π r²
=4*22/7*6370*6370
=510109600km²
75%of 510109600 km² is water
=75/100*510109600
=382582200km² of earth's surface is covered by water
so area covered by land=510109600-382582200
=127527400km²

Answer 2

Hope this helps.......