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Homework Help: Dimensions of angles

  1. Sep 10, 2008 #1
    what are the dimensions of angles???
  2. jcsd
  3. Sep 10, 2008 #2


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    Angles don't have units. It might be better to think of angles in terms of arcs. The "radian" measure of an angle is the length of the arc it subtends at a distance r divided by r. Since those are both distance measures, their ratio is "dimensionless".
  4. Sep 10, 2008 #3


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    Welcome to PF!

    Hi mahtab! Welcome to PF! :smile:

    Angles are dimensionless.

    Cos, sin, etc, are functions of angles, and, like log, they can only be functions of dimensionless numbers. :smile:
  5. Sep 10, 2008 #4
    thank you HallsofIvy&tiny-tim !:)
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