## Geometry: Common Core (15th Edition)

$m \angle P$ = $80^{\circ}$
In congruent polygons, vertices are named in the exact order of their matching vertices. If $WXYZ$ is congruent to $PQRS$, then vertex $W$ corresponds to vertex $P$, vertex $X$ corresponds to vertex $Q$, vertex $Y$ corresponds to vertex $R$, and vertex $Z$ corresponds to vertex $S$. Therefore, $\angle P$ is congruent to $\angle W$. So, $m \angle P$ is equal to $m \angle W$. If $m \angle W$ is $80^{\circ}$, then $m \angle P$ is $80^{\circ}$.