Question

The bearing of q from p
is 45.find the bearing of p from q

Answer 1

Angles around a point sum to 360°

The acute angle at q = 45°

The bearing of p from q = 360° - 45° = 315°

Answer 2

ever hear of doing a 180? That means turning in the opposite direction.
So add or subtract 180, so that the results is between 0 and 360
45+180 = 225