Question

which angle is supplementary to \angle1?

Explanation:

Step1: Recall the definition of supplementary angles

Supplementary angles are two angles whose sum is \(180^{\circ}\).

Step2: Analyze the relationship between \(\angle1\) and \(\angle3\)

Looking at the figure, \(\angle1\) and \(\angle3\) form a linear pair. A linear pair of angles is supplementary.

Answer:

\(\angle3\)