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.(adsbygoogle = window.adsbygoogle || []).push({});

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

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# Conversion help please

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