Answer: 120°
Step-by-step explanation:
Use the formula for Interior angle of a regular polygon:
[tex]I=\dfrac{180^o(n-2)}{n}\qquad\text{where n represents the number of sides}\\\\\\I_6=\dfrac{180^o(6-2)}{6}\\\\\\.\quad =\dfrac{180^o(4)}{6}\\\\\\.\quad =30^o(4)\\\\\\.\quad =\large\boxed{120^o}[/tex]