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I known an infinitesimal relation between the solid angle Î© with the azimutal angle Î¸ and zenital Ï†, that's given by dÂ²Î© = sin(Ï†) dÏ† dÎ¸. But this is infinitesimal relation, exist other relationnon infinitesimalbetween the solind angle with the plane angles? Thanks!

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# Solid angle and plane

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