Surveying
The following points form a pair of homologous points:

Photo plumb point and ground plumb point
All listed here
Photo principal point and ground principal point
Photo isocenter and ground isocenter

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Surveying
For a line AB

none is correct
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

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