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Diameter of the Earth

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The highest point of the Andes is about 4 miles above sea level.  If a straight line from this point reaches the surface of the water [sea] at a distance of 178.25 miles, what is the diameter of the earth?

Columbian Calculator, 1846

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"Diameter of the Earth," Loci (July 2006)

Dummy View - NOT TO BE DELETED