Bearings

[dior1]

Hey guys. With only a couple of weeks til our exams, I'm starting to freak out over the fact that no matter how often i i practice these questions, i continue to get them wrong!
for example, questions 2 and 9 on last years multiple choice exam still stump me!

Does anybody have a clear explanation and example that could help me out with this?

[dior1]

bump?

[xXNovaxX]

bump=yes
answer to question= I get stumped as well, the book has terrible explanations.

[dior1]

naw well atleast im not the only one that finds it difficult sometimes.
does anybody have a good explanation ?

[TrueTears]

Q 2 from last years exam:

Extend CB

The (extended) line CB makes with the north direction is found by:

Thus the bearing of B from C is

Thus D

[TrueTears]

Q 9:



We need to find out

must be a right angle since and if you extend NO downwards, the angle that the line makes with OM is also

Thus





Thus

[TrueTears]

A few things you should look out for when doing bearing questions.

- Create a lot of supplementary or complementary angles.
- Know the properties of triangles very well, ie, the sum of the 2 interior angles of a triangle is equal to the exterior angle on the opposite vertex.
- Look out for Pythagorean triples as that will immediately tell you the triangle is a right angle.
- Try to create (if possible) right angle triangles so you can use trig.

Hope that helps! If you still have queries please let me know