Question

angle relationships
boom cards
vertical angles are formed by two intersecting lines and are directly across from each other. their measures are always equal.
∠1 ≅ ∠□

Explanation:

Step1: Identify vertical angles

Vertical angles are opposite intersecting lines.

Step2: Match ∠1's vertical angle

∠1 is opposite ∠3 at intersection E.

Answer:

$\angle 3$