Please help. Prove by using vectors.

Question

If ABCD is a paralleloid, E is the middle of AB. If DE intersects AC on F. Then, Prove AF=AC/3 and FE=DE/3

Answer 1

The MIDDLE of a line segment is not an accepted mathematical term.

And where did this word paralleloid come from...is Common Core ashamed of parallelograms?

Your second sentence is incorrect; it lacks the conclusion (consequence) of the hypothetical IF.