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# FP3 Polar Co-ordinates - Help Please !!

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1. http://store.aqa.org.uk/qual/pdf/AQA-MFP3-TEXTBOOK.PDF

Q 5bi and 5bii on page 52 please, I got the rest correct.

I know I am expected to show some working before asking for help, but I am completely stumped by how I am to prove AB is a constant and then find a polar equation for M (mid point of AB).

Thnx
2. perhaps this might help....
Attached Images
3. Polar Coordinates Problem.pdf (34.6 KB, 61 views)
4. (Original post by mikelbird)
perhaps this might help....
PRSOM!

One thing, I don't get how BO = .
5. (Original post by member910132)
PRSOM!

One thing, I don't get how BO = .
Because AB is a straight line going through O so if the angle for OA is phi radians then surely the angle for B is phi plus pi radians....OK!!
6. I thought it would be pi take phi if it's on the other side of the straight line.

This was posted from The Student Room's iPhone/iPad App
7. OK..written in a hurry but cos phi minus pi is also minus cos phi so the result stands...sorry about the confusion
8. (Original post by mikelbird)
OK..written in a hurry but cos phi minus pi is also minus cos phi so the result stands...sorry about the confusion
Np, I appreciate you going out your way to make the pdf and your time

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