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.