A) \[{{25}^{{}^\circ }}\]
B) \[{{35}^{{}^\circ }}\]
C) \[{{55}^{{}^\circ }}\]
D) \[{{70}^{{}^\circ }}\]
Correct Answer: C
Solution :
(c): In \[\Delta AOB\] \[\angle OBA+\angle OAB+\angle AOB={{180}^{{}^\circ }}\] \[x+{{35}^{{}^\circ }}+{{90}^{{}^\circ }}={{180}^{{}^\circ }}\] \[x={{180}^{{}^\circ }}-{{125}^{{}^\circ }}={{55}^{{}^\circ }}\]
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