Surveying
For adjusting a quadrilateral whose both the diagonals are observed, the equations of conditions involved, are

Two angle equations and two side equations
None of these
Three angle equations and one side equation
One angle equation and three side equations

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Surveying
Pick up the correct statement for horizontal photographs.

All listed here
Parallel lines do not appear parallel in central projection
The two sides of a road meet at the vanishing point
The lines parallel to the negative plane are projected as parallel lines

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