A) \[{{150}^{{}^\circ }}\]
B) \[{{140}^{{}^\circ }}\]
C) \[{{130}^{{}^\circ }}\]
D) \[{{160}^{{}^\circ }}\]
Correct Answer: B
Solution :
(b): From fig, \[x+{{90}^{{}^\circ }}+{{70}^{{}^\circ }}+{{60}^{{}^\circ }}={{360}^{{}^\circ }}\] \[x={{140}^{{}^\circ }}\]
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