A) \[{{70}^{o}}\]
B) \[{{79}^{o}}\]
C) \[{{80}^{o}}\]
D) \[{{81}^{o}}\]
Correct Answer: A
Solution :
Let \[\angle A={{60}^{o}},\angle B={{80}^{o}}\] and \[\angle C={{150}^{o}}\] We know that \[\angle A+\angle B+\angle C+\angle D={{360}^{o}}\] \[\Rightarrow \] \[{{60}^{o}}+{{80}^{o}}+{{150}^{o}}+\angle D={{360}^{o}}\] \[\Rightarrow \] \[\angle D={{70}^{o}}\]
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