hexagon
angle sum of angles
use the image below to help you

Answer:
x = 105°
Step-by-step explanation:
interior angle of regular polygon = (180 x (n - 2)) / n
hexagon: (180 x 4) / 6 = 120
octagon: (180 x 6) / 8 = 135
x = 360 -120 -135 =105°