Explanation:
Triangle BAC is a right triangle because Angles [tex]m\angle BCA=63º[/tex]The sum of the measures of the interior angles of any triangle is 180º:
[tex]\begin{gathered} m\angle BCA+m\angle ABC+m\angle BAC=180º \\ 63º+90º+m\angle BAC=180º \\ m\angle BAC=180º-63º-90º=27º \end{gathered}[/tex]And angles [tex]\begin{gathered} m\angle BAC=m\angle\text{KAI} \\ 27º=xº \end{gathered}[/tex]Answer:
x = 27