Surveying
For a line AB

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

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Surveying
Systematic errors

Always follow some definite mathematical law
All listed here
Can be removed by applying corrections to the observed values
Are also known as cumulative errors

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