Answer:
\[\because \,\,\,\,\,\,\,AB||DC\] \[\therefore \] \[m\angle C+m\angle B={{180}^{\text{o}}}\] | i.e., the sum of interior opposite angles is \[{{180}^{\text{o}}}\]. \[\Rightarrow \] \[m\angle C+{{120}^{\text{o}}}={{180}^{\text{o}}}\] \[\Rightarrow \] \[m\angle C={{180}^{\text{o}}}-{{120}^{\text{o}}}={{60}^{\text{o}}}\].
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