Question

ab is parallel to CD and f is equal to 30 degree find angle ECD​

Answer 1

Answer:

an obtuse angle from 91 to 178

Answer 2

given :

<F=30degree

AB||CD

solution:

in ∆FAE

<F+<A+<FEA=180

30+90+<FEA=180

180-120=<FEA

60=<FEA

now,<FEA=<BEC=60°(vertically opposite angles)

AB||CD which implies EB||CD

we know that some of consecutive interir angles are 180

<BEC+ECD=180

<ECD=180-60

<ECD=120