Solid Angles

  • Thread starter kerasene
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  • #1
kerasene
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Hey i'm having a hard time wrapping my head around the concept of solid angles and finding the solid angle of any area on the surface of a sphere i'm basically asking for a crash course none of my textbooks explain it well at all
 

Answers and Replies

  • #2
mathman
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The most direct way is is the area of the surface patch divided by r2, where r is the radius of the sphere.
 
  • #3
HallsofIvy
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Mathman is correct. That's how the measure of a solid angle is defined- the "solid angle" intecepted by the entire sphere around a point has measure [itex]4\pi[/itex], the surface area, [itex]4\pi r^2[/itex], divided by [itex]r^2[/itex].
 

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