What is the total land area of earth approximately in square kilometres?
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radius is 6400 km. area= 4πr^2
4*3.14* 6400^2= 514457600 km^2
land area is 30% so 154337280km^2
4*3.14* 6400^2= 514457600 km^2
land area is 30% so 154337280km^2
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