Question

∠1 and ∠2 are vertical angles. ∠2 has a measure of 31°. what is the measure of ∠1? enter your answer in the box.

Explanation:

Step1: Recall vertical angles property

Vertical angles are congruent (equal in measure).

Step2: Apply property to ∠1 and ∠2

Since $\angle 1$ and $\angle 2$ are vertical angles, $m\angle 1 = m\angle 2$.

Step3: Substitute given angle measure

$m\angle 1 = 31^\circ$

Answer:

$31^\circ$