Differential area of a sphere

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  • Thread starter AyoubEd
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  • #1
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please , i'm french , so i didn't quite get the meaning of this sentence.
 

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  • #2
wrobel
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I also have not got it . Area on two dimensional manifold is a 2-form not 1-form
 
  • #3
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it's confusing and wasting my time :frown:.
thank you anyway.
 
  • #5
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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##
 
  • #6
10
2
Thanks a lot guys.
that was very helpful
 

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