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Answer:
z=40°
Step-by-step explanation:
In ∆ABC,
2x+80°=2y (sum of interior opposite
angles=exterior angle)
=>2(x+40°)=2y
=>x+40°=y ->(1)
In ∆BCF,
x+z=y(sum of interior opposite
angles=exterior angle)
=>x+z=x+40° (from (1) )
=>z=40° (ans)
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