A) \[{{100}^{{}^\circ }},{{60}^{{}^\circ }}\]
B) \[{{90}^{{}^\circ }},{{50}^{{}^\circ }}\]
C) \[{{110}^{{}^\circ }},{{70}^{{}^\circ }}\]
D) \[{{120}^{{}^\circ }},{{60}^{{}^\circ }}\]
Correct Answer: A
Solution :
(a): \[AB\parallel CD\] \[\Rightarrow x={{100}^{{}^\circ }}\left( alternate\angle s \right)\] \[\angle y+{{120}^{{}^\circ }}={{180}^{{}^\circ }}\] (interior angle sum) \[\Rightarrow y={{60}^{{}^\circ }}.\]
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