1. Sep 3, 2008

Darkhrse99

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.

Thanks
Jason

2. Sep 3, 2008

rock.freak667

Do you know the formula for the surface area/volume of a sphere?

3. Sep 3, 2008

Darkhrse99

Surface area is 4pi R^2 and surface volume is 4pi R^3

4. Sep 3, 2008

rock.freak667

Note that the volume is $\frac{4}{3} \pi r^3$

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:

1km2=1km*1km=1000m*1000m=106m2

Hence 1km2=106m2

Similary do the same for 1km3 and you'll get it out.

5. Sep 3, 2008

Thanks.