Back Azimuth of a Survey Line

Easyazimuthback azimuth
The back azimuth of 287° is:
  1. A17°
  2. B107°
  3. C73°
  4. D253°
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Answer: B. 107°

Back azimuth = forward azimuth ± 180°, so 287° − 180° = 107°.
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