Surveying
The great circle whose plane is perpendicular to the axis of rotation of the earth, is called

0° latitude
All of these
Terrestrial equator
Equator

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Surveying
For a line AB

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

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