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Polar co-ordinates help

  1. Jan 26, 2009 #1
    1. The problem statement, all variables and given/known data
    CPT4011.jpg


    2. Relevant equations



    3. The attempt at a solution
    a) I can get a quite easily:
    theta = + and - pi/3

    r = + and - 3a/2

    b) Can someone guide me throught how to get this. I want to find the distance between A and B
    that is

    (3a/2,pi/3), (-3a/2,-pi/3)

    Thanks :)
     
  2. jcsd
  3. Apr 26, 2009 #2
    I still dont have a clue how to do part b. The mark scheme mentions using 2rSin(ө), is that teh equation for measuring between two poitns??? To find the distance do I want a straigh line between A and B or do I want to actually have an arc of length r and angle 2ө? Should I convert to cartesian form using x = rcos(ө) and y = rsin(x)

    I dont have a clue :\

    Thanks :)
     
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