Sure, I can answer your question. I need to make an assumption about the image or diagram you are referring to, as it's not provided.
Assumption: I'm assuming that ∠BFC and ∠EFD are vertical angles.
Explanation:
Vertical angles are pairs of opposite angles formed by the intersection of two lines. A key property of vertical angles is that they are always equal in measure.
Given:
m∠BFC=70∘
If ∠BFC and ∠EFD are vertical angles, then:
m∠EFD=m∠BFC
m∠EFD=70∘
Answer:
If ∠BFC and ∠EFD are vertical angles, then m∠EFD=70∘.