If \[\angle b={{62}^{o}}\] and\[\angle c={{77}^{o}}\], find\[\angle a\].
A) \[{{39}^{o}}\]
B) \[{{141}^{o}}\]
C) \[{{41}^{o}}\]
D) \[{{139}^{o}}\]
Correct Answer: C
Solution :
\[\angle a+\angle b+\angle c={{180}^{o}}\] \[\therefore \]\[\angle a={{180}^{o}}-{{62}^{o}}={{77}^{o}}\] \[={{180}^{o}}-{{139}^{o}}={{41}^{o}}\]
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