# 2.  Let $\overline {PQ}$ be the perpendicular to the line segment $\overline {XY}$ . Let $\overline {PQ}$ and $\overline {XY}$ intersect in the point A. What is the measure of $\angle PAY$ ?

$PQ\perp XY$
$PA\perp AY$
Therefore $\angle PAY=90^{o}$