SSC CHSL 15 Nov 2015 Shift 2 Paper

Sum of each interior angle of a polygon with 'n' sides = (n − 2) × 180°
⇒ Sum of interior angles of hexagon = (6 − 2) × 180°
= $4\times 180)=720°$
∴ Measure of each interior angle of a regular hexagon = $\frac{720}{6}=120°$