Question

find the measure of ∠ybd.

Explanation:

Step1: Identify vertical - angle relationship

Vertical angles are equal. $\angle YBD$ and the given $141^{\circ}$ angle are vertical angles.

Step2: Determine the measure of $\angle YBD$

Since vertical angles are congruent, $m\angle YBD = 141^{\circ}$.

Answer:

$141^{\circ}$