What do you mean by deflection angle?
What is deflection angle in surveying?
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Deflection angles are angles of 0 to 180 degrees and should not be greater than 90 degrees.
The algebraic sum of the deflection angles in a polygon is 360 degrees. Deflection angles are positive and negative when the direction of the angle is left and right respectively.
Deflection angle in surveying is the difference between the measured direction of a line and the actual direction of a line, due to minor inaccuracies in the instrument used for taking the measurement. It is usually accounted for by adjusting the readings taken.