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Homework Help: Conversion help please!

  1. Sep 3, 2008 #1
    1. The problem statement, all variables and given/known data
    The earth's radius is 6.37x10^6 meters. I need to convert this to surface area in km^2 and it's volume in cubic kilometers.

    I'm not sure where to start on either one.

  2. jcsd
  3. Sep 3, 2008 #2


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    Do you know the formula for the surface area/volume of a sphere?
  4. Sep 3, 2008 #3
    Surface area is 4pi R^2 and surface volume is 4pi R^3
  5. Sep 3, 2008 #4


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    Note that the volume is [itex]\frac{4}{3} \pi r^3[/itex]

    So just put the radius into the formulas and for the surface area, the answer will be in m2. To convert, think of it like this:


    Hence 1km2=106m2

    Similary do the same for 1km3 and you'll get it out.
  6. Sep 3, 2008 #5
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