Question

due friday by 11:59pm points 20 submitting an external tool 20/20 if m∠1 = 30°, then m∠3 = 60° 150° 30° undetermined

Explanation:

Step1: Identify angle - pair relationship

$\angle1$ and $\angle3$ are vertical angles.

Step2: Recall vertical - angle property

Vertical angles are congruent. So $m\angle1=m\angle3$.

Answer:

C. $30^{\circ}$