Answer:
x = 144°
Step-by-step explanation:
the sum of the interior angles of a polygon is
sum = 180°(n - 2) ← n is the number of sides
The figure here has n = 8, hence
sum of interior angles = 180° × 6 = 1080°, hence
129 + 132 + 136 + 124 + 141 + 158 + 116 + x = 1080
936 + x = 1080 ( subtract 936 from both sides )
x = 144°
