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

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

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Surveying
The meridian of a place is

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
A semi-circle which passes through the place and is terminated at the poles

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