Question

In the given figure, what value of x will make EF||CD, if AB||CD?
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Answer 1

Answer:

angle ABC= angle BCD =65°

angle BCD = angle BCE + angle ECD

65=25 + ECD

angle ECD = 40

Extend point E name it R

angle REC= angle ECD = 40°

angle REC +angle CEF = 180

40 + CEF =180

angle CEF = 140