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  1. A and B are two points on earth’s surface and on latitude 400 N. The two points are on the longitude 500W and 1300E respectively. Calculate the distance from A to B along a parallel of latitude in kilometers.
  2. The shortest distance from A to B along a great circle in kilometres (Take π = 22/7 and radius of the earth = 6370km)

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  1. d = 180/360 x 2 x 6370 x 22/7 Cos 40º
    1/2 x 22/7 x 2 4879.7
    = 15336.2 km
     
  2. 100/360 x 2 6370 x 22/7
    = 11122.2

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