Surveying
The rise and fall method of levelling provides a complete check on

backsight
intermediate sight
foresight
All of these

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

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
Sum of the three angles less than six right angles and greater than two right angles

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