A) \[{{80}^{{}^\circ }}\]
B) \[{{90}^{{}^\circ }}\]
C) \[{{110}^{{}^\circ }}\]
D) \[{{160}^{{}^\circ }}\]
Correct Answer: C
Solution :
(c): Internal \[\Delta \] \[\angle A=180-110={{70}^{{}^\circ }}\] \[\angle C=180-{{90}^{{}^\circ }}\] \[\angle D=180-50={{130}^{{}^\circ }}\] \[\angle B=360-{{70}^{{}^\circ }}-{{90}^{{}^\circ }}-130={{70}^{{}^\circ }}\] \[\Rightarrow x=180-70={{110}^{{}^\circ }}.\]
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