Surveying
If the distance between the projectors is altered by a movement along X-axis of one projector,

The length of the air base is increased
The scale of the model is altered
All listed here
y-parallax is not affected

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Surveying
Pick up the incorrect statement from the following. In a spherical triangle

Sum of the three angles less than six right angles and greater than two right angles
Every angle is less than two right angles
Sum of the three angles is equal to two right angles
Sum of any two sides is greater than the third

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