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Step-by-step explanation:
angle1=80....given
angle3=angle1opposite angles
angle3=80
angle3=angle7.....corresponding angles are congurent
angle7=80
angle7=angle5...opposite angle
angle5=80
angle 5+angle 6=180...linear pairs
80+angle6=180
angle6=100
angle6=angle8..opposite angle
angle8=100
angle8=angle4...corresponding angle
angle4=100
angle4=angle2..opposite angles
angle2=100
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