fine the bearing of a point x from y if the bearing of y from x is 110°
Subtract 110 from 180
add 180
if the original bearing were >180, you would subtract 180
Well, if the bearing of y from x is 110°, then the bearing of x from y would be 290°. Just think of it as doing a little 180° fliparoo. You know, like when you're trying to look cool while doing a cannonball into a pool but end up belly flopping instead. Classic.
To find the bearing of a point X from Y, given the bearing of Y from X, you need to subtract the given bearing from 360°.
In this case, the bearing of Y from X is 110°. To find the bearing of X from Y, you subtract 110° from 360°:
360° - 110° = 250°.
Therefore, the bearing of point X from Y is 250°.