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Question
With regard to Trigonometric Levelling, which one of the following statements is correct at its simplest applications?
A.
Determination of the elevations of station is based on the observed vertical angles and the horizontal distances
B.
Determination of the horizontal distances is based on the observed vertical angles
C.
Determination of the vertical angles is based on the observed horizontal distances
D.
Determination of the horizontal distances is based on the observed vertical angles and the measured elevations.
Answer ( Option A)

Determination of the elevations of station is based on the observed vertical angles and the horizontal distances

Solution

Trigonometric Levelling is the branch of Surveying in which we find out the vertical distance between two points or the elevation of a station by taking the vertical angular observations and the known horizontal distances.

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