proofing triangles and paralleograms?

Question

I'm in the junior certificate year and am doing higher level maths which is way too gard for me but anyway, we got this question for hoework that reads..'prove that ae is equal to dc..I no it doesnt make sence when you cant see the paralleogram but does anyone know how you do these questions?

Answer 1

Need more information on where a, e, d, and c are.  Are they vertices, points inside the parallelgram, etc.