Surveying
Cross staff is an instrument used for

None of these
measuring approximate horizontal angles
setting out right angles
measuring bearings of the lines

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Surveying
Pick up the correct statement from the following. The difference between the longitudes of the places is obtained.

All of these
By adding their longitudes if places are in the different hemispheres
By subtracting the sum of their longitudes exceeding 180° from 360° if places are in different hemispheres
By subtracting their longitudes if places are in the same hemisphere

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