Question 1189705
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A and B are two places on longitude 10W. If their latitudes differ by 63 {{{highlight(degrees)}}}, 
find the distance of A from B.
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The points A and B lie in one great circle of the Earth, with the central angle between them of 63 degrees.


THEREFORE, the distance from A to B is  {{{2*pi*R*(63/360)}}} = {{{2*3.14159*6400*(63/360)}}} = 7037 kilometers (approximately).


In the formula, R = 6400 is the approximate radius of the Earth (in kilometers).


(see this Wikipedia article https://en.wikipedia.org/wiki/Earth_radius  )
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Solved and explained.