use the appropriate theorem(s) to find the measure of ∠1. m∠1 = □°

use the appropriate theorem(s) to find the measure of ∠1. m∠1 = □°

use the appropriate theorem(s) to find the measure of ∠1. m∠1 = □°

Answer

Explanation:

Step1: Recall vertical - angles property

Vertical angles are equal.

Step2: Identify vertical - angle relationship

The angle given ($120^{\circ}$) and $\angle1$ are vertical angles.

Answer:

$120$