To find the measure of one interior angle of a regular hexagon, you can use the formula for the interior angles of a polygon:
\[ \text{Interior angle} = \frac{(n-2) \times 180°}{n} \]
where \( n \) is the number of sides. For a hexagon, \( n = 6 \).
Plugging in the value:
\[ \text{Interior angle} = \frac{(6-2) \times 180°}{6} = \frac{4 \times 180°}{6} = \frac{720°}{6} = 120° \]
So, the measure of one interior angle of a regular hexagon is \( 120° \).