The figure given is a heptagon,
The angle sum of a heptagon is 900°.
Therefore,
Sum of all angles of a heptagon = 900
[tex]12 0 + 158 + 126 + 125 + 121 + 139 + x = 900[/tex]
[tex]789 + x = 900[/tex]
[tex]x = 900 - 789[/tex]
[tex]x = 111[/tex]
Therefore,
x = 111°
