Respuesta :

Opposite angles in a quadrilateral inscribed in a circle add up to 180, therefore:

[tex]\begin{gathered} m\angle ACD+m\angle ABD=180 \\ 54+m\angle ABD=180 \\ m\angle ABD=180-54 \\ m\angle ABD=126^{\circ} \end{gathered}[/tex]

Answer:

b. 126