Surveying
The shortest distance between two places measured along the surface of the earth, is

Length of the parallel between their longitudes
None of these
Length of the arc of the great circle passing through them
Length of the equator between their longitudes

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Surveying
For a line AB

none is correct
the forebearing of AB and back bearing of AB differ by 180°
both (A) and (B) are correct
the forebearing of AB and back bearing of BA differ by 180°

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