Distance between Cities Charleston, West Virginia, is due north of Jacksonville, Florida. Find the distance between Charleston (38°21' north latitude) and Jacksonville (30°20' north latitude). Assume that the radius of Earth is 3960 miles.

In problem, the latitude of a location L is the angle formed by a ray drawn from the center of Earth to the Equator and a ray drawn from the center of Earth to L. See the figure.

 

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North Pole Equator South Pole