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# Help with polar coordinates! watch

1. Hi,

I have no idea what the mark scheme is talking about.
thorough explanation will be of great help, I have mock in a few days

thanks!

papers are attached below. It's the last question
Attached Images
2. 1.PDF (197.2 KB, 29 views)
3. 2.PDF (337.2 KB, 28 views)
4. I think the mark scheme for this looks unnecessarily complicated, posibly because there are several ways to do this part and it tries to cover them all.

By this point, you know the polar coordinates of N, P and Q, so it would be easy to find their cartesian coordiantes. You can therefore work out the lengths NP, NQ and PQ. You should now be able to find the angle you need using the cosine rule (but note that the angle is obtuse - it might be a good idea to draw on the diagram).
5. (Original post by Pangol)
I think the mark scheme for this looks unnecessarily complicated, posibly because there are several ways to do this part and it tries to cover them all.

By this point, you know the polar coordinates of N, P and Q, so it would be easy to find their cartesian coordiantes. You can therefore work out the lengths NP, NQ and PQ. You should now be able to find the angle you need using the cosine rule (but note that the angle is obtuse - it might be a good idea to draw on the diagram).
wow thank you!

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