A circle can be circumscribed about a quadrilateral if the opposite angles are supplementary.
The quadrilateral in the figure in the question must satisfy the following conditions, therefore:
[tex]\begin{gathered} m\angle A+m\angle C=180\degree \\ m\angle B+m\angle D=180\degree \end{gathered}[/tex]
We can make the check as follows:
[tex]\begin{gathered} 90+90=180 \\ 120+60=180 \end{gathered}[/tex]
Therefore, a circle could be circumscribed about the quadrilateral.
The correct option is TRUE.
