Answer:
74°
Step-by-step explanation:
Quadrilateral QUAD is inscribed in a circle. Therefore it is a cyclic quadrilateral. Opposite angles of a cyclic quadrilateral are supplementary.
[tex] \therefore \angle D + \angle U = 180°\\
\therefore \angle D + 106° = 180°\\
\therefore \angle D = 180° - 106°\\
\huge\purple {\boxed {\therefore \angle D = 74°}}[/tex]
