"Circumference Formula", by Randall Munroe, licensed under Creative Commons Attribution-NonCommercial 2.5 License

## Alt Text

Assume r' refers to the radius of Earth Prime, and r'' means radius in inches.

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"Circumference Formula", by Randall Munroe, licensed under Creative Commons Attribution-NonCommercial 2.5 License

Assume r' refers to the radius of Earth Prime, and r'' means radius in inches.