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Q.

If semi vertex angle of cone is 60⁰, then solid angle made by the cone is :

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a

$π$ steredian

b

2 $π$ steredian

c

4 $π$ steredian

d

$\frac{π}{3}$ red

answer is B.

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Detailed Solution

The solid angle made by cone of semi vertex angle $θ is Ω = 2 π (1 - \cos θ) = 2 π (1 - \cos 60) = π$

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