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Math Help - cylindrical polar coords

  1. #1
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    cylindrical polar coords

    when trying to use green's theorem and i parametrise x,y and z using cylindrical polar coordinates, where x= Rcos (delta) y=Rsin(delta) z=z,

    does the unit normal vector become cos(delta) i + sin(delta) j?

    i thought it should be Rcos (delta) i + Rsin(delta) j but my formula list says otherwise.
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  2. #2
    Super Member Failure's Avatar
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    Quote Originally Posted by alexandrabel90 View Post
    when trying to use green's theorem and i parametrise x,y and z using cylindrical polar coordinates, where x= Rcos (delta) y=Rsin(delta) z=z,

    does the unit normal vector become cos(delta) i + sin(delta) j?
    yes.

    i thought it should be Rcos (delta) i + Rsin(delta) j but my formula list says otherwise.
    Well, except if R=1, this is not a unit vector: it has length R.
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