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Estimate the solid angle projected at the center of a sphere by a patch of 1.1...

Estimate the solid angle projected at the center of a sphere by a patch of 1.1 cm diameter on the sphere's surface if its radius is 2.5 m. Express your answer using 3 sig.

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Find the plane angle of the cone formed by the solid angle in 2 dimensional. Apply the expression of solid angle in terms of plane angle to find the solid angle.

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