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Earlier discussion
1 older comment kept for context.
Oluwaseun Adeyemi
Sum of interior angle \(= (n-2) \times 180\)
For hexagon \((n) = 6\)
Sum of interior angle \(= (6-2) \times 180\)
\(=4 \times 180 = 720\)
\(120+100+80+150+x+130=720\)
\(580 + x = 720\)
\(x = 720 - 580\)
\(x = 140^{\circ}\)