Respuesta :

devishri1977

Answer:

x = 144

Step-by-step explanation:

Sum of all angles of n-sided polygon = 180 * (n - 2)

Sum of all angles of 8-sided polygon = 180  * 6 = 1080

x + 129 + 132 + 136 + 124 + 141 + 158 + 116 = 1080

x + 936 = 1080

x = 1080 - 936

x = 144