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I Differential area of a sphere

  1. Jun 29, 2016 #1
    please , i'm french , so i didn't quite get the meaning of this sentence.

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  2. jcsd
  3. Jun 29, 2016 #2
    I also have not got it . Area on two dimensional manifold is a 2-form not 1-form
  4. Jun 29, 2016 #3
    it's confusing and wasting my time :frown:.
    thank you anyway.
  5. Jun 29, 2016 #4
  6. Jun 29, 2016 #5


    Staff: Mentor

    Yes Nasu has got it right, the differential area of a sphere in spherical coordinates is:

    ##dA = R^2 sin \theta d\theta d\phi##

    and integrating over ##d\phi##

    and then setting R=1 you get

    ##Aring = 2\pi * sin \theta d\theta##
  7. Jun 30, 2016 #6
    Thanks a lot guys.
    that was very helpful
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