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Explanation:
AF is parallel to CD
Therefore, AF is the transversal
Now AF is parallel to ED
therefore, EF is the transversal
Therefore, Angle AFE = 42 degree
We know that A straight line is always 180 degree
therefore, Angle AFC + AFE + EFD = 180 degree.
68o + 42o + EFD = 180 degree.
110o + Angle EFD = 180 degree
therefore Angle Efd = 70 degree
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BEF=EFC (alternate interior angle)
BED+DEF=EFA+AFC
BED+42°= EFA+68°
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