If bearing of AB is N30° W and bearing of BC is N40°E, the find the angle ABC

The bearing of line AB is 200° and that of BC is 270°, the inclined angle ABC, is

If the bearing of a line AB is 210° and that of CB is 150°, then find the angle ABC
The bearing of a line AB is N30°E and that of CB is S80°E, the find the angle between AB and BC

Back bearing of a line BA is 35° and bearing of BC is 125° then find the included angle ABC
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