Physics, asked by alageshwaridavid, 6 days ago

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Answered by ganishreev
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A solid angle is a 3D angular volume that is defined analogously to the definition of a plane angle in two dimensions. ... A solid angle, ω, made up of all the lines from a closed curve meeting at a vertex, is defined by the surface area of a sphere subtended by the lines and by the radius of that sphere
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