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 earths surface is covered by water?

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Solution

Radius of earth (Sphere) = 6370 km
Water on the earth $= \frac{3}{4} t o t a l a r e a ∴ R e q u i r e d a r e a = \frac{1}{4} (4 π r^{2}) = π r^{2} = \frac{22}{7} \times (6370)^{2} k m = \frac{22 \times 6370 \times 6370}{7} k m^{2} = 22 \times 910 \times 6370 k m^{2} = 127527400 k m^{2}$

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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 earths surface is covered by water?

Radius of earth (Sphere) = 6370 km Water on the earth=34total area∴Required area=14(4πr2)=πr2=227×(6370)2km=22×6370×63707km2=22×910×6370km2=127527400km2

Radius of earth (Sphere) = 6370 km
Water on the earth $= \frac{3}{4} t o t a l a r e a ∴ R e q u i r e d a r e a = \frac{1}{4} (4 π r^{2}) = π r^{2} = \frac{22}{7} \times (6370)^{2} k m = \frac{22 \times 6370 \times 6370}{7} k m^{2} = 22 \times 910 \times 6370 k m^{2} = 127527400 k m^{2}$