SSC CHSL 2021 PYQ — Question 61

The correct answer is option 1 i.e. 170º.

Sin A = 0.5 

⇒ Sin A = $\frac{5}{10}$ 

⇒ Sin A = $\frac{1}{2}$

⇒ Sin A = sin(180°- 30°)

⇒ sin A = sin 150°   

[If sin A = 150, then $\frac{A}{3}$ = 50,  is not possible in this case]

⇒ sin A = sin (360°+ 150°)

⇒ sin A = sin 510° 

⇒ A = 510° 

$\frac{A}{3}$ =$\frac{510^o}{3}$ = 170°