Assume that City A and City B are located on the same meridian in the Northern hemisphere and that the earth is a sphere of radius 4000 mi. The latitudes of City A and City B are and , respectively.
Solution: For parts (a) and (b), proceed as in Exercise 2:
Similarly,
(c) We use the Equation , where s is the distance along the surface of the earth between the two cities, R is the radius of the earth, and is the central angle between the two cities, that is, the difference in their latitudes. The distance between the two cities is then:
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Luis Valdez Sanchez