What is Earth's spatial surface?

Question
Answer 1

Total surface area of earth: 510,072,000 sq km

Total water surface area: 70.8% (361,132,000 sq km)
Total land surface area: 29.2% (148,940,000 sq km)

Ref: http://chartsbin.com/view/wwu

According to modern estimates, the surface area of the Earth is approximately 510 million square km #(5.1 x 10^8 km^2)# or 196,900,000 square miles. Determining this was not only a matter of ascertaining Earth’s dimensions, but also its proper shape.
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Answer 2
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