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2 May, 20:47

What is the approximate distance between Portland, Oregon (45° north, 122° west), and San Francisco, California (37° north, 122° west). Use 3,960 miles for the radius of Earth.

258 miles

553 miles

720 miles

1,346 miles

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Answers (1)
  1. 2 May, 21:35
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    From the given data in the problem, the longitude is essentially the same, and using the coordinates, the locations are 8° apart. The 8° is 8/360 of the circumference of the circle. The circumference is 2π • 3960. Substituting, (8 • 2π • 3960) / 360 = 4π • 44 = 553 miles. Thus, option B is the answer.
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