Question

Find $m∠C$ in Figure if $\bar {AB}|| \bar{DC}$

Answer 1

Given that, $\bar{AB}||\bar{DC}$
$∠B + ∠C = 180°$ (Angles on the same side of transversal)
$\Rightarrow$ $120 º + ∠C = 180°$
$\Rightarrow$ $∠C = 60°$