The bearing of a point B, from a point A, is based on the angle that the straight line AB makes with the line AN which goes due North from A. The angle is measured in the clockwise direction and is normally expressed as a 3 digit number (including leading zeros).
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You find the angle with a fixed direction using trigonometry. You then convert it to an angle measured in degrees, clockwise from North, and written as a three digit number.
It is a measure of angular displacement, expressed as a three digit number. It starts at North = 000 and is measured in the clockwise direction.
plane trigonometry spherical trigonometry
The main kinds are plane trigonometry and solid trigonometry. The latter will include trigonometry in hyper-spaces.
The definition of a true compass bearing - A true bearing is measured in relation to the fixed horizontal reference plane of True North, that is using the direction towards the geographic North Pole as a reference point.