Given data:
The given parallelogram.
The adjacent angles in parallelogram are supplementary in nature.
[tex]m\angle R+m\angle O=180^{\circ}[/tex]
Substitute the given values in the above expression.
[tex]\begin{gathered} 121^{\circ}+m\angle O=180^{\circ} \\ m\angle O=59^{\circ} \end{gathered}[/tex]
Thus, the angle O is 59 degrees.
