Question

In the given figure below, decide whether l is parallel to m.

Answer 1

∠x + 123° = 180° (Linear pair)

∠x = 180° − 123° = 57°

For l and m to be parallel to each other, the corresponding angles (∠ABC and ∠x) should be equal. Here, their measures are 57° and 57°, respectively. Hence, the lines l and m are parallel to each other.