Answer:
(AFB + EFD) ( AFB + CFD) (BFC + EFD) (AFE + BFC) (AFE + CFD)
Explanation:
Vertical angles are angles that touch at the tips, but don't connect at their sides. One thing that all of these angle pairs have in common is that they have the point F in the middle, meaning that F is the center point in which these angles meet. These are all of the vertical angle possibilities. Use which ones are necessary for you.