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I Spherical angle?

  1. Mar 23, 2017 #1
    Calculating the angles in 3D shapes can be a very frustrating and annoying thing. So, I was wondering, are there any mathematical terms, which describe a 3d angles?( "angles" between three lines- part of a sphere)
    If there are such terms, suppose a triangular pyramid. Is the sum of those "angles" is a constant? just as the sum of angles in a triangle is 180 degrees.
  2. jcsd
  3. Mar 23, 2017 #2


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    Staff: Mentor

    Solid angle?
    There are some formulas for the solid angles in a pyramid in that article.
  4. Mar 24, 2017 #3


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