Bearing 数学

b.  Mark the angle in a clockwise direction by indicating the turn between the north line and the line joining the centre of the compass to the point P.

The bearing of point Q is 300º which is the number of degrees in the angle measured in a clockwise direction from the north line to the line joining the centre of the compass at O with the point Q (i.e. OQ).

Find the angle in degrees that describes the compass bearing

a.  Mark the angle in a clockwise direction by indicating the turn between the north line and the line joining the centre of the compass to the point P.

For example, the bearing of point P is 065º which is the number of degrees in the angle measured in a clockwise direction from the north line to the line joining the centre of the compass at O with the point P (i.e. OP).

Bearing angle

The cardinal point S corresponds to 180°.  It is clear from the diagram that the required angle is 60° larger than 180°.  So, the angle measured in a clockwise direction from the north line to the line joining the centre of the compass to point P is 180° + 60° = 240°.

The cardinal point S corresponds to 180°.  It is clear from the diagram that the required angle is 40° less than 180°.  So, the angle measured in a clockwise direction from the north line to the line joining the centre of the compass to point P is 180° – 40° = 140°.

On a bearing of

The true bearing to a point is the angle measured in degrees in a clockwise direction from the north line.  We will refer to the true bearing simply as the bearing.

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The cardinal point W corresponds to 270°.  It is clear from the diagram that the required angle is 20° larger than 270°.  So, the angle measured in a clockwise direction from the north line to the line joining the centre of the compass to point P is 270° + 20° = 290°.

The conventional bearing of a point is stated as the number of degrees east or west of the north-south line.  We will refer to the conventional bearing simply as the direction.

The four main directions of a compass are known as cardinal points.  They are north (N), east (E), south (S) and west (W).  Sometimes, the half-cardinal points of north-east (NE), north-west (NW), south-east (SE) and south-west (SW) are shown on the compass.  The above compass shows degree measurements from 0° to 360° in 10° intervals with:

Compass bearing

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c.  Mark the angle in a clockwise direction by indicating the turn between the north line and the line joining the centre of the compass to the point P.

d.  Mark the angle in a clockwise direction by indicating the turn between the north line and the line joining the centre of the compass to the point P.

When using a directional compass, hold the compass so that the point marked north points directly away from you.  Note that the magnetic needle always points to the north.

The bearing of a point is the number of degrees in the angle measured in a clockwise direction from the north line to the line joining the centre of the compass with the point.