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Conversion help please

  1. Sep 3, 2008 #1
    I need to convert the earth's radius of 6.37 x 10^6 in to the km, But I need it to be the circumference in km.


    I started out with 6.37x 10^6 times (1km/1000m) which gives me 6.37x 10^3. Now I need to convert to the circumference, but not sure how. The answer is 4.00x10^4. I don't see how 6.37x10^3 is going to come close to the answer. Where do I go from here?

    Thanks
    Jason
     
    Last edited: Sep 3, 2008
  2. jcsd
  3. Sep 3, 2008 #2

    Borek

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    Staff: Mentor

    Re: Conversion help please!

    What is the formula for a circumference?
     
    Last edited: Sep 3, 2008
  4. Sep 3, 2008 #3
    Re: Conversion help please!

    I don't know?
     
  5. Sep 3, 2008 #4

    Borek

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    Staff: Mentor

    I find it hard to believe that you were not taught it earlier. But if not - check in your textbook, handbook or in wikipedia, or just google it.
     
  6. Sep 3, 2008 #5
    Sorry about that. I found the formula. I wasn't thinking right. By using that formula 6.37x10^3 times Pi equals 2.0000. Than i multiplied it by 2 and got 4.00x10^4.
     
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