Surveying
The parallax equation Δp = BmΔh/H - h is applicable to entire overlap of the photographs only if parallax is measured

Parallel to base line
Normal to base line
Both (A) and (B)
Neither (A) nor (B)

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Surveying
For a line AB

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

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