A) \[{{20}^{o}}\]
B) \[{{90}^{o}}\]
C) \[{{60}^{o}}\]
D) \[{{180}^{o}}\]
Correct Answer: C
Solution :
The sum of supplementary angles is\[{{180}^{o}}\]. \[\angle ABC={{120}^{o}}\Rightarrow \] Its supplementary angles add up to \[{{180}^{o}}\].
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