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Why we draw the angle with y-axis?

  1. Aug 23, 2006 #1
    When we want to indicate the direction of a vector,why we draw the angle with the vertical (y-axis) side?
     

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  2. jcsd
  3. Aug 23, 2006 #2

    robphy

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    Technically speaking, one can draw the angle with respect to any convenient reference direction... and, for clarity, you should somehow indicate that reference direction and sense (clockwise or counterclockwise). A clear diagram, as you've drawn, is fine.

    Standard conventions usually use the counterclockwise angle from the positive x-axis. However, if you use anything else, do what I suggested above.
     
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