Question

ch 3.2 - test review
find the measure of ∠1
find the measure of ∠2

Explanation:

Step1: Identify vertical - angle relationship

Vertical angles are equal. $\angle1$ and the given $81^{\circ}$ angle are vertical angles.
So, $\angle1=81^{\circ}$.

Step2: Identify vertical - angle relationship for $\angle2$

$\angle2$ and the given $81^{\circ}$ angle are vertical angles.
So, $\angle2 = 81^{\circ}$.

Answer:

Measure of $\angle1 = 81^{\circ}$, Measure of $\angle2 = 81^{\circ}$