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## Main Question or Discussion Point

Hello.

How does one derive the first formula on this page(the integral Omega = ...)

http://en.wikipedia.org/wiki/Solid_angle" [Broken]

?

I guess the problem is to project some surface onto the unit sphere, so the formula makes sense with the dot product and all, but I just cannot derive it in detail. I have tried very hard but not had any luck :(

How does one derive the first formula on this page(the integral Omega = ...)

http://en.wikipedia.org/wiki/Solid_angle" [Broken]

?

I guess the problem is to project some surface onto the unit sphere, so the formula makes sense with the dot product and all, but I just cannot derive it in detail. I have tried very hard but not had any luck :(

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