SSC CGL 2022 PYQ — Question 56

The correct answer is Option 3 i.e. 5.

AB = 10

Angle BAC = 30°

sin 30° = $1 \over 2$

From the given diagram,

sinA = $BC \over AB$ 

⇒ sin 30° = $x \over 10$

⇒ $1 \over 2$ = $x \over 10$ 

⇒ x = 5

Hence the length of BC is 5.