Surveying
For a line AB

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

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Surveying
A ’level line’ is a

line parallel to the mean spheriodal surface of earth
horizontal line
line passing through the center of cross hairs and the center of eye piece
line passing through the objective lens and the eye-piece of a dumpy or tilting level

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