Calculating Volume of Earth Using Radius 6.37x10^6m and Correct Sig Figs

mrserv0n
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The radius of the Earth is 6.37X10^6 meters. Determine the volume of the Earth to the correct number of sig figures.

to find the volume I used 4/3 (3.14)(6.37x10^6)^3
3.14(2.58x10^20) = 8.10x10^20
4/3 or 1.33(8.10x10^20) =

1.08x10^21m^3 ?
 
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okay, why would you doubt your result?
 

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