Answer:
[tex]31^\circ[/tex]
Step-by-step explanation:
The sum of the angle of a triangle is equal to [tex]180^\circ[/tex].
[tex]99^\circ+50^\circ+\text{Unknown Angle}=180^\circ\\\text{Unknown Angle}=180^\circ-99^\circ-50^\circ\\\text{Unknown Angle}=31^\circ[/tex]
