Answer:
x = 100 degree
Step-by-step explanation:
EF//GC => NF // OC
∠ANE=∠ONF [Vertically opposite angles]
∠ONF=80
In Quadrilateral OCFN,
NF // OC
∠ ONF + x = 180 [Linear Pair]
=> 80 + x = 180
=> x = 180-80
=> x = 100
x=100°
corresponding angles
