In Quadrantal system back bearing of a line may be obtained...

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In Quadrantal system back bearing of a line may be obtained from its forward bearing by . . . . . . . .

A. Adding 180°, if the given bearing less than 90°

B. Subtracting 90°, if the given bearing is more than 90°

C. Changing the cardinal points by substituting N for Sand E for Wand Vise versa

D. Substracting 180°, if the given bearing is more than 180°

Answer: Option D

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