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Solid angle and plane

  1. Dec 23, 2013 #1

    I known an infinitesimal relation between the solid angle Ω with the azimutal angle θ and zenital φ, that's given by d²Ω = sin(φ) dφ dθ. But this is infinitesimal relation, exist other relation non infinitesimal between the solind angle with the plane angles? Thanks!
  2. jcsd
  3. Dec 23, 2013 #2


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    Hello Jhenrique! :smile:

    Solid angle is the same as area (on a unit sphere), for which there are standard formulas.

    In particular, if you know all three angles of a triangle, the area is their sum minus π.

    (i don't remember the other formulas, but a quick google search will find them :wink:)
  4. Dec 23, 2013 #3
    I found nothing more. I thought if an area can have 2 definitions A = xy and dA = dxdy, then the solid angle could have 2 definitions too, 1 algebric definition and 1 infinitesimal definition...
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