Surveying
The length of a parallel of λ latitude between two meridians is equal to difference in longitudes multiplied by

cot λ
cos λ
sin λ
tan λ

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Surveying
Homologous points are

Corresponding points on the ground and photograph
Nodal points of the camera lens
Plumb points of stereo pair of photographs
Opposite corners of a photograph

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Surveying
For a line AB

both (A) and (B) are correct
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°

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Surveying
The meridian of a place is

A semi-circle which passes through the place and is terminated at the poles
An arc of the great circle which passes through the place and is perpendicular to the equator
A great circle whose plane is perpendicular to the axis of rotation and it also passes through the place
A great circle passing through the place and the poles

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