Question

If the bearing of p from q is 120° , what is the bearing of q from p​

Answer 1

300°

Explanation:

The reverse bearing is different by 180°. It will be ...

Q from P = (120° +180°) = 300°

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Additional comment

Bearings are always in the range 0 to 360° (not including 360°). That means the reverse bearing will be the original less 180° when the original is 180° or more. It will be the original plus 180° when the original is less than 180° (as here).