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Math Help - polar coordinates

  1. #1
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    polar coordinates

    Hello

    i have attached my question as well as the answer to it

    i have been asked to sketch this polar graph. This is from an past exam paper hence i would sketch it by hand. Although for the purpose of the answer the graph was created on computer.

    from notes i now that the graph is a spiral.

    However in the marking scheme you must show where the curve crosses the axis. And i don't know how to find out from the equation where the curve crosses the axis

    I was wondering if someone could tell how i can work it out

    thanks
    Attached Thumbnails Attached Thumbnails polar coordinates-polar-coordinates.gif  
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  2. #2
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    Quote Originally Posted by rpatel View Post
    Hello

    i have attached my question as well as the answer to it

    i have been asked to sketch this polar graph. This is from an past exam paper hence i would sketch it by hand. Although for the purpose of the answer the graph was created on computer.

    from notes i now that the graph is a spiral.

    However in the marking scheme you must show where the curve crosses the axis. And i don't know how to find out from the equation where the curve crosses the axis

    I was wondering if someone could tell how i can work it out

    thanks
    "axis" or "axes"? The curve crosses the x-axis whenever \theta is a multiple of \pi. It crosses the y-axis whenever \theta is an odd multiple of \pi/2. Do you see why?
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  3. #3
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    Sep 2005
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    could u explain this further please. Maybe give me some examples of some values in my case

    thanks
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