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# What is the solid subtended by a hemisphere at a point inside it ?

Solid angle $\omega = \large\frac{S \cos \theta}{r^2}$
$S= 2 \pi r^2 ,\theta =0^{\circ}$
$\therefore \omega= \large\frac{2 \pi r^2 \times 1}{r^2}$$=2 \pi$ steradian